ahi_c0h3a ahi_c0h4a
Name
ahi_c0h4
Label
Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Description

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

Calculation
ahi_c0h4 = 60 * (hrembp4 + hrop4 + hnrbp4 + hnrop4 + carbp + carop + canbp + canop) / slpprdp
Units
events per hour
Type
numeric
Tags
aasm15_acceptable cahi_ca0uhp3x4u_f1t2
Sleep Heart Health Study (SHHS) Visit Number vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
N Mean StdDev Median Min Max Unknown Total
Visit 1 5,804 6.2 ± 8.2 3.4 0.0 94.1 - 5,804
Interim Follow-up Visit - - - - - - - -
Visit 2 2,651 7.9 ± 9.3 4.8 0.0 87.4 1,429 4,080
CVD Outcomes - - - - - - - -
Age at Sleep Heart Health Study Visit One (SHHS1) vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 5,804 6.2 ± 8.2 3.4 0.0 94.1 - 5,804
35-44 years 342 4.5 ± 7.4 1.8 0.0 55.4 - 342
45-54 years 1,017 5.2 ± 8.1 2.2 0.0 85.9 - 1,017
55-64 years 1,769 6.2 ± 8.0 3.2 0.0 67.3 - 1,769
65-74 years 1,617 6.8 ± 8.6 4.1 0.0 94.1 - 1,617
75-84 years 955 6.8 ± 8.1 4.2 0.0 55.9 - 955
85 years or older 104 6.7 ± 7.2 4.1 0.0 41.3 - 104
Gender of the participant vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 5,804 6.2 ± 8.2 3.4 0.0 94.1 - 5,804
Male 2,765 7.9 ± 8.9 5.0 0.0 85.9 - 2,765
Female 3,039 4.7 ± 7.1 2.2 0.0 94.1 - 3,039
Gender of the participant vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Visit 2
N Mean StdDev Median Min Max Unknown Total
Total 2,651 7.9 ± 9.3 4.8 0.0 87.4 1,429 4,080
Male 1,226 9.9 ± 10.2 6.7 0.0 78.0 635 1,861
Female 1,425 6.1 ± 8.1 3.5 0.0 87.4 794 2,219
Race of the participant vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 5,804 6.2 ± 8.2 3.4 0.0 94.1 - 5,804
White 4,907 6.3 ± 8.3 3.4 0.0 94.1 - 4,907
Black 515 6.3 ± 8.3 3.0 0.0 50.6 - 515
Other 382 5.2 ± 6.5 2.7 0.0 33.9 - 382
Race of the participant vs Central Apnea-Hypopnea Index: (Central apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type II polysomnography
Visit 2
N Mean StdDev Median Min Max Unknown Total
Total 2,651 7.9 ± 9.3 4.8 0.0 87.4 1,429 4,080
White 2,311 8.0 ± 9.4 4.9 0.0 87.4 1,276 3,587
Black 181 7.2 ± 8.1 4.2 0.0 41.9 75 256
Other 159 7.4 ± 9.3 4.8 0.0 69.7 78 237