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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
rdim4pa
under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in
CHAT variables
[(total number of apneas and hypopneas with >= 3% desaturation or arousal) / (hours of sleep)]
Apnea-Hypopnea Index: (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type II polysomnography
ahi_a0h4a
under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in
MESA variables
Calculated
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 or with arousal) / hour of sleep from type II polysomnography
ahi_c0h4a
under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in
MESA variables
Calculated - Summary metric of sleep disordered breathing events.
Obstructive Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type II polysomnography
ahi_o0h4a
under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in
MESA variables
Calculated - Summary metric of sleep disordered breathing events.
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