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Apnea, Bariatric surgery, and CPAP study

Name Label Folder
nsrrid
NSRR subject identifier
NSRR subject identifier

The National Sleep Research Resource (NSRR) subject identifier links the subject's data and files.

Administrative
rand_siteid
Site identifier
Site identifier

Recruitment site was a stratification factor for randomization.

Administrative
rand_treatmentarm
Randomized treatment arm
Randomized treatment arm Administrative
visitnumber
Visit number
Visit number Administrative
bmi
Body mass index (BMI)
Body mass index (BMI)

Calculated

Anthropometry
age
Age of the participant
Age of the participant Demographics
ethnicity
Ethnicity (Hispanic or Latino) of the participant
Ethnicity (Hispanic or Latino) of the participant

"Hispanic or Latino" is defined as a person of Cuban, Mexican, Puerto Rican, South or Central American or other Spanish culture or origin regardless of race.

Demographics
gender
Gender of the participant
Gender of the participant Demographics
race
Race of the participant
Race of the participant

Race is presented as three (3) categories based on suggested Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC) de-identification procedures.

Demographics
ahi_ap0uhp3x3u
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
ahi_ap0uhp3x4u
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) Berry RB et al. 2012 (PubMed ID:23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].

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

Polysomnography (PSG)
pctdursp_o90
Percent of total sleep duration with oxygen saturation < 90%
Percent of total sleep duration with oxygen saturation < 90%

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
ttldursp
Total sleep duration
Total sleep duration

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time

Polysomnography (PSG)
ess_total
Epworth Sleepiness Scale: Total score
Epworth Sleepiness Scale: Total score

Calculated - Total score based on an 8-item questionnaires ranking likelihood of dozing off Johns MW 1991 (PubMed ID: 1798888). Scale 0-3 for individual items; 0 to 24 for overall score.

Search for all ESS variables within this dataset

Questionnaires/Epworth Sleepiness Scale (ESS)
daystomonth09
Days from baseline to 9-month visit
Days from baseline to 9-month visit Administrative
daystomonth18
Days from baseline to 18-month visit
Days from baseline to 18-month visit Administrative
daystosurgery
Days from baseline to laparoscopic gastric banding (LGB) surgery
Days from baseline to laparoscopic gastric banding (LGB) surgery Administrative
surgery_occurred
Surgery occurred
Surgery occurred

The subject underwent laparoscopic gastric banding (LGB) surgery.

Administrative
height
Height
Height Anthropometry
weight
Weight
Weight Anthropometry
ahi_ap0uhp3x3r
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). Berry RB et al. 2012 (PubMed ID:23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]

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

Polysomnography (PSG)
ahi_ap0uhp3x4r
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep
Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
avglvlhr
Average heart rate during total sleep duration
Average heart rate during total sleep duration Polysomnography (PSG)
avglvlsa
Average oxygen saturation level in total sleep duration
Average oxygen saturation level in total sleep duration Polysomnography (PSG)
cahi_ca0uhp3x3r
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation or with arousal) / hour of sleep
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). Berry RB et al. 2012 (PubMed ID:23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]

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

Polysomnography (PSG)
cahi_ca0uhp3x3u
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation and with or without arousal) / hour of sleep
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 3% desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
cahi_ca0uhp3x4r
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation or with arousal) / hour of sleep
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
cahi_ca0uhp3x4u
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation and with or without arousal) / hour of sleep
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with > 4% desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) Berry RB et al. 2012 (PubMed ID:23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].

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

Polysomnography (PSG)
cai_ca0u
Central Apnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep
Central Apnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
hi_hp3x0u
Hypopnea Index: (hypopneas with > 30% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of sleep
Hypopnea Index: (hypopneas with > 30% flow reduction and with no oxygen desaturation threshold used and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
minlvlsa
Minimum oxygen saturation level in total sleep duration
Minimum oxygen saturation level in total sleep duration Polysomnography (PSG)
oahi_oa0uhp3x3r
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). Berry RB et al. 2012 (PubMed ID:23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]

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

Polysomnography (PSG)
oahi_oa0uhp3x3u
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
oahi_oa0uhp3x4r
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
oahi_oa0uhp3x4u
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) Berry RB et al. 2012 (PubMed ID:23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].

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

Polysomnography (PSG)
oai_oa0u
Obstructive Apnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep
Obstructive Apnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal) / hour of sleep

Calculated - Summary metric of sleep disordered breathing events.

Polysomnography (PSG)
pctdursp_o75
Percent of total sleep duration with oxygen saturation < 75%
Percent of total sleep duration with oxygen saturation < 75%

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_o80
Percent of total sleep duration with oxygen saturation < 80%
Percent of total sleep duration with oxygen saturation < 80%

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_o85
Percent of total sleep duration with oxygen saturation < 85%
Percent of total sleep duration with oxygen saturation < 85%

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_s1
Percent of total sleep duration in stage 1 sleep
Percent of total sleep duration in stage 1 sleep

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_s2
Percent of total sleep duration in stage 2 sleep
Percent of total sleep duration in stage 2 sleep

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_s3
Percent of total sleep duration in stage 3 - 4 sleep
Percent of total sleep duration in stage 3 - 4 sleep

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.

Polysomnography (PSG)
pctdursp_sr
Percent of sleep time in REM sleep
Percent of sleep time in REM sleep Polysomnography (PSG)
ttldursp_s1
Total sleep duration in stage 1 sleep
Total sleep duration in stage 1 sleep Polysomnography (PSG)
ttldursp_s2
Total sleep duration in stage 2 sleep
Total sleep duration in stage 2 sleep Polysomnography (PSG)
ttldursp_s3
Total sleep duration in stage 3 - 4 sleep
Total sleep duration in stage 3 - 4 sleep Polysomnography (PSG)
ttldursp_sr
Total sleep duration in REM sleep
Total sleep duration in REM sleep Polysomnography (PSG)
ess_1sitread
Epworth Sleepiness Scale: Chance of dozing while sitting and reading
Epworth Sleepiness Scale: Chance of dozing while sitting and reading

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

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Questionnaires/Epworth Sleepiness Scale (ESS)
ess_2watchingtv
Epworth Sleepiness Scale: Chance of dozing while watching TV
Epworth Sleepiness Scale: Chance of dozing while watching TV

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

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Questionnaires/Epworth Sleepiness Scale (ESS)
ess_3sitinactive
Epworth Sleepiness Scale: Chance of dozing while sitting, inactive in a public place
Epworth Sleepiness Scale: Chance of dozing while sitting, inactive in a public place

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

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Questionnaires/Epworth Sleepiness Scale (ESS)
ess_4passenger
Epworth Sleepiness Scale: Chance of dozing as a passenger in a car for an hour without a break
Epworth Sleepiness Scale: Chance of dozing as a passenger in a car for an hour without a break

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

Search for all ESS variables within this dataset

Questionnaires/Epworth Sleepiness Scale (ESS)
ess_5lyingdown
Epworth Sleepiness Scale: Chance of dozing while lying down in the afternoon when circumstances permit
Epworth Sleepiness Scale: Chance of dozing while lying down in the afternoon when circumstances permit

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

Search for all ESS variables within this dataset

Questionnaires/Epworth Sleepiness Scale (ESS)
ess_6sittalk
Epworth Sleepiness Scale: Chance of dozing while sitting and talking to someone
Epworth Sleepiness Scale: Chance of dozing while sitting and talking to someone

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

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Questionnaires/Epworth Sleepiness Scale (ESS)
ess_7afterlunch
Epworth Sleepiness Scale: Chance of dozing while sitting quietly after lunch without alcohol
Epworth Sleepiness Scale: Chance of dozing while sitting quietly after lunch without alcohol

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

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Questionnaires/Epworth Sleepiness Scale (ESS)
ess_8stoppedcar
Epworth Sleepiness Scale: Chance of dozing while in a car, while stopped for a few minutes in traffic
Epworth Sleepiness Scale: Chance of dozing while in a car, while stopped for a few minutes in traffic

Item from the Epworth Sleepiness Scale Johns MW 1991 (PubMed ID: 1798888)

Search for all ESS variables within this dataset

Questionnaires/Epworth Sleepiness Scale (ESS)