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pctlt80 under Sleep/Polysomnography (PSG)/Oxygen Saturation (SaO2) in CHAT variables
[100*(total number of minutes with oxygen saturation (SaO2) < 80) / (Total Sleep Time (TST))].
pctlt80 under Measurements/Polysomnography (PSG) in CCSHS variables
Ratio of the number of minutes with oxygen saturation (SaO2) under 80% to the total sleep time expressed in hours.
pctdursp_o80 under Polysomnography (PSG) in ABC variables
Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, conventionally called total sleep time.
pctdursp_salt80_f1t3 under Sleep Monitoring/Polysomnography/Oxygen Saturation in NUMOM2B variables
Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep
pctsa80h under Sleep Monitoring/Polysomnography/Sleep Architecture in SHHS variables
pctsa80h under Sleep Monitoring/Polysomnography/Sleep Architecture in CFS variables