flow - Search - Sleep Data - National Sleep Research Resource

Total Duration of Apnea and Hypopnea (Supine): Apneas with no oxygen desaturation threshold used + hypopneas with > 50% flow reduction and no oxygen desaturation threshold used during artifact-free estimated sleep in supine position from type IV home sleep apnea test

slpa44 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Apnea and hypopnea events were not distinguished as separate event types during scoring. Both were classified as a respiratory event that required a 50% reduction in Nasal Flow signal for at least 10 seconds.

Total Duration of Apnea and Hypopnea: Apneas with >= 1% oxygen desaturation + hypopneas with > 50% flow reduction and >= 1% oxygen desaturation during artifact-free estimated sleep from type IV home sleep apnea test

slpa51 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Non-Supine): Apneas with >= 1% oxygen desaturation + hypopneas with > 50% flow reduction and >= 1% oxygen desaturation during artifact-free estimated sleep in non-supine position from type IV home sleep apnea test

slpa52 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Supine): Apneas with >= 1% oxygen desaturation + hypopneas with > 50% flow reduction and >= 1% oxygen desaturation during artifact-free estimated sleep in supine position from type IV home sleep apnea test

slpa53 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea: Apneas with >= 3% oxygen desaturation + hypopneas with > 50% flow reduction and >= 3% oxygen desaturation during artifact-free estimated sleep from type IV home sleep apnea test

slpa60 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Non-Supine): Apneas with no oxygen desaturation threshold used + hypopneas with > 50% flow reduction and >= 3% oxygen desaturation during artifact-free estimated sleep in non-supine position from type IV home sleep apnea test

slpa61 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Supine): Apneas with >= 3% oxygen desaturation + hypopneas with > 50% flow reduction and >= 3% oxygen desaturation during artifact-free estimated sleep in supine position from type IV home sleep apnea test

slpa62 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea: Apneas with >= 4% oxygen desaturation + hypopneas with > 50% flow reduction and >= 4% oxygen desaturation during artifact-free estimated sleep from type IV home sleep apnea test

slpa69 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Non-Supine): Apneas with >= 4% oxygen desaturation + hypopneas with > 50% flow reduction and >= 4% oxygen desaturation during artifact-free estimated sleep in non-supine position from type IV home sleep apnea test

slpa70 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Total Duration of Apnea and Hypopnea (Supine): Apneas with >= 4% oxygen desaturation + hypopneas with > 50% flow reduction and >= 4% oxygen desaturation during artifact-free estimated sleep in supine position from type IV home sleep apnea test

slpa71 under Sleep Monitoring/Polysomnography/Sleep Architecture in HCHS variables

Flow limitation

npflow under Sleep Monitoring/Polysomnography/Signal Quality in SOF variables

1=flow limitation observed

Apnea-Hypopnea Index: (All apneas + hypopneas with >50% flow reduction or discernible flow reduction with >=3% desat or arousal) / hour of sleep

nsrr_ahi_chicago1999 under Harmonized/Polysomnography/Apnea-Hypopnea Indices in APPLES variables

Harmonized by the NSRR team.The definition of hypopnea events is consistent with the following clinical guidelines: American Academy of Sleep Medicine (AASM) Chicago 1999 standard. Sleep 1999 (PubMed ID:10450601) Search for all AHI variables consistent with the same clinical guidelines within this dataset Refer to the source for detailed definition for respiratory events: :rditstpsg:

Hypopnea Index: (Hypopneas with > 50% flow reduction and without 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 from type I polysomnography

hypindextstpsg under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in APPLES variables

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: American Academy of Sleep Medicine (AASM) Chicago 1999 standard. Sleep 1999 (PubMed ID:10450601) Search for all AHI variables consistent with the same clinical guidelines within this dataset

Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without 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 from type I polysomnography

rditstpsg under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in APPLES variables

Hypopneas are defined using two criteria: a > 50%, but <= 90% amplitude decrease from baseline of the nasal pressure signal; or if there was a clear amplitude reduction of the nasal pressure signal that did not reach the above criterion but it was associated with either an oxygen desaturation > 3% or an arousal, and the event duration was >= 10 seconds. The definition of hypopnea events is consistent with the following clinical guidelines: American Academy of Sleep Medicine (AASM) Chicago 1999 standard. Sleep 1999 (PubMed ID:10450601) Search for all AHI variables consistent with the same clinical guidelines within this dataset

Apnea-Hypopnea Index (NREM): (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep from type I polysomnography

rdinrempsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables

Apnea-Hypopnea Index (REM): (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep from type I polysomnography

rdirempsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables

Total number of hypopneas in REM sleep: (hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) from type I polysomnography

remnumhyppsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables

Total number of hypopneas: (hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) from type I polysomnography

respnumhyppsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables

Flow limitation

npflow under Sleep Monitoring/Polysomnography/Signal Quality in CHAT variables

1=flow limitation observed

equipment-mros1.md