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Childhood Adenotonsillectomy Trial

Name Label Folder
clusterid
Recoded Site ID for longitudinal models
Recoded Site ID for longitudinal models

The original Site ID was removed from the dataset because it was considered identifiable. This variable has obfuscated the original Site IDs.

Administrative
new_pid
Original Participant ID
Original Participant ID

This is the participant identifier that is present on Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) datasets. Use nsrrid when linking these data to other data on the National Sleep Research Resource (NSRR).

Administrative
nsrrid
NSRR Subject Identifier
NSRR Subject Identifier

The National Sleep Research Resource (NSRR) subject identifer links the subject's data and files. Use new_pid to link with Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) and cohort-specific data.

Administrative
completer_per_protocol
Participant completed the study as per protocol
Participant completed the study as per protocol Administrative/CONSORT Diagram Components
arm
Treatment Arm
Treatment Arm

The randomization code assigned by the Data Management System (DMS).

Administrative/Randomization
ant3
Child's standing height
Child's standing height Anthropometry
ant4
Child's weight
Child's weight Anthropometry
ant5
Child's Body mass index (BMI)
Child's Body mass index (BMI) Anthropometry
bmiz
Z-score for body mass index (BMI)-for-age
Z-score for body mass index (BMI)-for-age Anthropometry
chol
Total cholesterol levels
Total cholesterol levels Clinical Data/Laboratory Tests
crp_ug_ml
C-reactive protein (CRP) levels
C-reactive protein (CRP) levels Clinical Data/Laboratory Tests
glucose_mmol
Blood glucose levels
Blood glucose levels Clinical Data/Laboratory Tests
hdl_mg_dl
Blood high-density lipoprotein (HDL) levels
Blood high-density lipoprotein (HDL) levels Clinical Data/Laboratory Tests
homa
Homeostasis Model Assessment (HOMA) estimate of insulin resistance
Homeostasis Model Assessment (HOMA) estimate of insulin resistance Clinical Data/Laboratory Tests
insulin_uil_ml
Blood insulin levels
Blood insulin levels Clinical Data/Laboratory Tests
ldl_mg_dl
Blood low-density lipoprotein (LDL) levels
Blood low-density lipoprotein (LDL) levels Clinical Data/Laboratory Tests
sgl_mg_dl
Serum glucose levels
Serum glucose levels Clinical Data/Laboratory Tests
trig
Triglyceride levels
Triglyceride levels Clinical Data/Laboratory Tests
bri13b
GEC (BRI + MI) T score
GEC (BRI + MI) T score

From the Behavior Rating Inventory of Executive Function (BRIEF). Gioia G et al, 2010

Search for all BRIEF variables within this dataset

Clinical Data/Neurocognitive Testing/Behavior Rating Inventory of Executive Function(BRIEF)
bri13b_tr
MI T score
MI T score

From the Behavior Rating Inventory of Executive Function (BRIEF). Gioia G et al, 2010

Search for all BRIEF variables within this dataset

Clinical Data/Neurocognitive Testing/Behavior Rating Inventory of Executive Function(BRIEF)/Teacher's Form
nep10b_nepsy
Core Domain Scores Attn / Exec Scaled Scores
Core Domain Scores Attn / Exec Scaled Scores Clinical Data/Neurocognitive Testing/NEPSY
bp41
Average systolic blood pressure
Average systolic blood pressure Clinical Data/Vital Signs/Seated Blood Pressure
bp42
Average diastolic blood pressure
Average diastolic blood pressure Clinical Data/Vital Signs/Seated Blood Pressure
chi2
Child's gender
Child's gender Demographics
chi3
Child's ethnicity
Child's ethnicity Demographics
child_age
Child's age rounded to the nearest quarter year
Child's age rounded to the nearest quarter year

Provided by the data contributor for a more precise age than the ageyear_at_meas integer value. At follow-up, computed as the baseline age plus the time to follow-up anthropometry measurements (ant1).

Demographics
male
Child's gender
Child's gender Demographics
race3
Child's race
Child's race Demographics
chi5
Child's grade
Child's grade Demographics/Education
nsrr_bmi
Body mass index (BMI)
Body mass index (BMI)

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: ant5 at Baseline

Harmonized/Anthropometry
nsrr_bp_diastolic
Diastolic blood pressure
Diastolic blood pressure

Average resting diastolic blood pressure of three measurements collected from the upper arm in a single clinic visit. In cases where either of the measurements was missing, the average was calculated discarding the missing value.

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: bp42

Harmonized/Clinical Data
nsrr_bp_systolic
Systolic blood pressure
Systolic blood pressure

Average resting systolic blood pressure of three measurements collected from the upper arm in a single clinic visit. In cases where either of the measurements was missing, the average was calculated discarding the missing value.

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: bp41

Harmonized/Clinical Data
nsrr_age
Subject age
Subject age

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: child_age at Baseline

Harmonized/Demographics
nsrr_age_gt89
Indicates whether the subject's age (in years) used during date obfuscation is greater than 89 years
Indicates whether the subject's age (in years) used during date obfuscation is greater than 89 years

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: ageyear_at_meas at Baseline

Harmonized/Demographics
nsrr_ethnicity
Subject ethnicity
Subject ethnicity

Original missing value is recoded as "not reported".

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: chi3

Harmonized/Demographics
nsrr_race
Subject race
Subject race

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: ref4

Harmonized/Demographics
nsrr_sex
Subject sex
Subject sex

Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: male

Harmonized/Demographics
nsrr_ahi_hp3r_aasm07
Apnea-Hypopnea Index : (All apneas + hypopneas with >=50% nasal cannula [or alternative sensor] reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep
Apnea-Hypopnea Index : (All apneas + hypopneas with >=50% nasal cannula [or alternative sensor] reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep

Harmonized by the NSRR team.

The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007]

Refer to the source for detailed definition for respiratory events: ahi_a0h3a

Harmonized/Polysomnography/Apnea-Hypopnea Indices
nsrr_ahi_hp3u
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 3% oxygen desaturation) / hour of sleep
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 3% oxygen desaturation) / hour of sleep

Harmonized by the NSRR team. Refer to the source for detailed definition for respiratory events: ahi_a0h3

Harmonized/Polysomnography/Apnea-Hypopnea Indices
nsrr_ahi_hp4r
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 4% oxygen desaturation or with arousal) / hour of sleep
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 4% oxygen desaturation or with arousal) / hour of sleep

Harmonized by the NSRR team. Refer to the source for detailed definition for respiratory events: ahi_a0h4a

Harmonized/Polysomnography/Apnea-Hypopnea Indices
nsrr_ahi_hp4u
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 4% oxygen desaturation) / hour of sleep
Apnea-Hypopnea Index : (All apneas + hypopneas with >= 4% oxygen desaturation) / hour of sleep

Harmonized by the NSRR team. Refer to the source for detailed definition for respiratory events: ahi_a0h4

Harmonized/Polysomnography/Apnea-Hypopnea Indices
nsrr_phrnumar_f1
Arousal Index: Number of arousals per hour of sleep from polysomnography
Arousal Index: Number of arousals per hour of sleep from polysomnography

Harmonized by the NSRR team. Source: ai_all

Harmonized/Polysomnography/Arousal
nsrr_flag_spsw
Study scored sleep/wake rather than with full sleep staging if there is not sufficient quality on EEG lead. Studies scored as sleep wake have all sleep stages scored using a default of Stage 2 and no arousals are scored.
Study scored sleep/wake rather than with full sleep staging if there is not sufficient quality on EEG lead. Studies scored as sleep wake have all sleep stages scored using a default of Stage 2 and no arousals are scored.

Harmonized by the NSRR team. Source: slewake

Harmonized/Polysomnography/Signal Quality
nsrr_begtimbd_f1
Lights-out or In-bed clock time from polysomnography
Lights-out or In-bed clock time from polysomnography

Conventionally, this variable would be called the start of time in bed (TIB).

Harmonized by the NSRR team. Source: stloutp

Harmonized/Polysomnography/Sleep Architecture
nsrr_begtimsp_f1
Sleep onset time from polysomnography
Sleep onset time from polysomnography

Harmonized by the NSRR team. Source: stonsetp

Harmonized/Polysomnography/Sleep Architecture
nsrr_endtimbd_f1
Lights-on or out-bed clock time from polysomnography
Lights-on or out-bed clock time from polysomnography

Conventionally, this variable would be called the end of time in bed (TIB). In this dataset, it concurs with the last epoch of sleep.

Harmonized by the NSRR team. Source: stlonp

Harmonized/Polysomnography/Sleep Architecture
nsrr_pctdursp_s1
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 1 from polysomnography
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 1 from polysomnography

Harmonized by the NSRR team. Source: timest1p

Harmonized/Polysomnography/Sleep Architecture
nsrr_pctdursp_s2
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 2 from polysomnography
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 2 from polysomnography

Harmonized by the NSRR team. Source: timest2p

Harmonized/Polysomnography/Sleep Architecture
nsrr_pctdursp_s3
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 3/4 from polysomnography
Percentage of total sleep duration (i.e., total sleep time, TST) in stage 3/4 from polysomnography

Harmonized by the NSRR team. Source: times34p

Harmonized/Polysomnography/Sleep Architecture
nsrr_pctdursp_sr
Percentage of total sleep duration (i.e., total sleep time, TST) in REM from polysomnography
Percentage of total sleep duration (i.e., total sleep time, TST) in REM from polysomnography

Harmonized by the NSRR team. Source: timeremp

Harmonized/Polysomnography/Sleep Architecture
nsrr_tib_f1
Total In-bed Period: the interval between lights off/in-bed time and lights on/out-bed time from polysomnography
Total In-bed Period: the interval between lights off/in-bed time and lights on/out-bed time from polysomnography

Harmonized by the NSRR team. Conventionally, this would be called time in bed (TIB)

Source: timebedp

Harmonized/Polysomnography/Sleep Architecture
nsrr_tst_f1
Total Sleep Duration: the interval between sleep onset and sleep offset while the participant is asleep from polysomnography
Total Sleep Duration: the interval between sleep onset and sleep offset while the participant is asleep from polysomnography

Conventionally, this would be called total sleep time (TST) (i.e. total time spent in stage 1 or greater).

Harmonized by the NSRR team. Source: slpprdp

Harmonized/Polysomnography/Sleep Architecture
nsrr_ttldursp_s1sr
REM Sleep Latency: the interval between the first sleep epoch and REM sleep excluding wake
REM Sleep Latency: the interval between the first sleep epoch and REM sleep excluding wake

Harmonized by the NSRR team. Source: remlaiip

Harmonized/Polysomnography/Sleep Architecture
nsrr_ttleffsp_f1
Sleep Efficiency: the ratio of total sleep duration (i.e., total sleep time) to in-bed period (i.e., time in bed) from polysomnography
Sleep Efficiency: the ratio of total sleep duration (i.e., total sleep time) to in-bed period (i.e., time in bed) from polysomnography

Harmonized by the NSRR team. Source: slpeffp

Harmonized/Polysomnography/Sleep Architecture
nsrr_ttllatsp_f1
Sleep Latency: the interval between lights-out/in-bed time and sleep onset from polysomnography
Sleep Latency: the interval between lights-out/in-bed time and sleep onset from polysomnography

Harmonized by the NSRR team. Source: slplatp

Harmonized/Polysomnography/Sleep Architecture
nsrr_ttlprdsp_s1sr
REM Sleep Latency: the interval between the first sleep epoch and REM sleep including wake
REM Sleep Latency: the interval between the first sleep epoch and REM sleep including wake

Harmonized by the NSRR team. Source: remlaip

Harmonized/Polysomnography/Sleep Architecture
nsrr_waso_f1
Wake After Sleep Onset: the total duration being awake between sleep onset and lights-on/out-bed time from polysomnography
Wake After Sleep Onset: the total duration being awake between sleep onset and lights-on/out-bed time from polysomnography

Harmonized by the NSRR team. Source: waso

Harmonized/Polysomnography/Sleep Architecture
oxitype
Oximeter type
Oximeter type

1 = Masimo, 2 = Nonin, 3 = Nonin Biologic

Sleep Monitoring/Polysomnography/Administrative
unittype
Polysomnography (PSG) unit type
Polysomnography (PSG) unit type Sleep Monitoring/Polysomnography/Administrative
ahi_a0h3
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_a0h3a
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007]

Search for all AHI variables consistent with the clinical guidelines within this dataset

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_a0h4
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_a0h4a
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_c0h3
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_c0h3a
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007]

Search for all AHI variables consistent with the clinical guidelines within this dataset

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_c0h4
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_c0h4a
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Central Apnea-Hypopnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_o0h3
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_o0h3a
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007]

Search for all AHI variables consistent with the clinical guidelines within this dataset

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_o0h4
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
ahi_o0h4a
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography
Obstructive Apnea-Hypopnea Index : (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
cai0p
Central Apnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep from type I polysomnography
Central Apnea Index : (Central apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep from type I polysomnography

[(Total number of central apneas associated with all desaturations) / (hours of sleep)]. Will be missing if Total Sleep Time (TST) is 0.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
cardnba
Total number of central apnea in NREM sleep in supine position: Central apneas with no oxygen desaturation threshold used only with arousal from type I polysomnography
Total number of central apnea in NREM sleep in supine position: Central apneas with no oxygen desaturation threshold used only with arousal from type I polysomnography Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
hmanrop
Mixed Apnea Index (NREM, Non-Supine): (Mixed apneas with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography
Mixed Apnea Index (NREM, Non-Supine): (Mixed apneas with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007]

Search for all AHI variables consistent with the clinical guidelines within this dataset

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3b
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (Supine): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep in supine position from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (Supine): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. Will be missing if Total Sleep Time (TST) is 0.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3_change
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) change between Baseline and End
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) change between Baseline and End Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3nr
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (NREM): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of NREM sleep from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (NREM): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of NREM sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. Will be missing if Total Sleep Time (TST) is 0.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3o
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (Non-Supine): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep in non-supine position from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (Non-Supine): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. Will be missing if Total Sleep Time (TST) is 0.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omahi3r
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (REM): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of REM sleep from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index (REM): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of REM sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events. Will be missing if Total Sleep Time (TST) is 0.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
omai0p
Childhood Adenotonsillectomy Trial (CHAT) Obstructive and Mixed Apnea Index (AHI): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep from type I polysomnography
Childhood Adenotonsillectomy Trial (CHAT) Obstructive and Mixed Apnea Index (AHI): (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim3p
Apnea-Hypopnea Index: (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index: (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep from type I polysomnography

[(total number of apneas and hypopneas associated with >= 3% desaturation) / (hours of sleep)]

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim3pa
Apnea-Hypopnea Index: (Apneas with >= 3% oxygen desaturation threshold used or with arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used or with arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index: (Apneas with >= 3% oxygen desaturation threshold used or with arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used or with arousal) / hour of sleep from type I polysomnography

[(total number of apneas and hypopneas with >= 3% desaturation or arousal) / (hours of sleep)]

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim3pns
Apnea-Hypopnea Index (Non-Supine): (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep in non-supine from type I polysomnography
Apnea-Hypopnea Index (Non-Supine): (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep in non-supine from type I polysomnography

[(total number of apneas and hypopneas in non-supine body position associated with >= 3% desaturation) / (hours of sleep)]. will be missing if no time non-supine or low position sensor quality.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim3ps
Apnea-Hypopnea Index (Supine): (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep in supine from type I polysomnography
Apnea-Hypopnea Index (Supine): (Apneas with >= 3% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation used and with or without arousal) / hour of sleep in supine from type I polysomnography

[(total number of apneas and hypopneas in supine body position associated with >= 3% desaturation) / (hours of sleep)]. will be missing if no time supine or low position sensor quality.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim4p
Apnea-Hypopnea Index: (Apneas with >= 4% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 4% oxygen desaturation used and with or without arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index: (Apneas with >= 4% oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with >= 4% oxygen desaturation used and with or without arousal) / hour of sleep from type I polysomnography

[(total number of apneas and hypopneas associated with >= 3% desaturation) / (hours of sleep)]

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdim4pa
Apnea-Hypopnea Index: (Apneas with >= 4% oxygen desaturation threshold used or with arousal+ hypopneas with > 50% flow reduction and with >= 4% oxygen desaturation used or with arousal) / hour of sleep from type I polysomnography
Apnea-Hypopnea Index: (Apneas with >= 4% oxygen desaturation threshold used or with arousal+ hypopneas with > 50% flow reduction and with >= 4% oxygen desaturation used or with arousal) / hour of sleep from type I polysomnography

[(total number of apneas and hypopneas with >= 3% desaturation or arousal) / (hours of sleep)]

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinba
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used only with arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used only with arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinba2
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 2% oxygen desaturation or with arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 2% oxygen desaturation or with arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinba3
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinbp
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinbp3
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (NREM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinoa3
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep in non-supine position from type I polysomnography
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinop
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdinop3
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography
Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdirba3
Hypopnea Index (REM, Supine): (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep in supine position from type I polysomnography
Hypopnea Index (REM, Supine): (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdirbp
Hypopnea Index (REM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of REM sleep in supine position from type I polysomnography
Hypopnea Index (REM, Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of REM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdirbp3
Hypopnea Index (REM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography
Hypopnea Index (REM, Supine) : (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of NREM sleep in supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdiroa
Hypopnea Index (REM, Non-Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used only with arousal) / hour of REM sleep in non-supine position from type I polysomnography
Hypopnea Index (REM, Non-Supine) : (Hypopneas with > 50% flow reduction and with no oxygen desaturation threshold used only with arousal) / hour of REM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices
rdiroa3
Hypopnea Index (REM, Non-Supine): (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep in non-supine position from type I polysomnography
Hypopnea Index (REM, Non-Supine): (Hypopneas with > 50% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep in non-supine position from type I polysomnography

Calculated - Summary metric of sleep disordered breathing events.

Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices