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pctdursp_salt75_f1t1 under Sleep Monitoring/Polysomnography 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.
pctsa75h under Sleep Monitoring/Polysomnography/Sleep Architecture in CFS variables
pctlt75 under Sleep Monitoring/Polysomnography/Sleep Architecture in CCSHS variables
Ratio of the number of minutes with oxygen saturation (SaO2) under 75% to the total sleep time expressed in hours.
pctsa75h under Sleep Monitoring/Polysomnography/Oxygen Saturation in CHAT variables
[(total time oxygen saturation (SaO2) is < 75%) / (Total Sleep Time (TST))] * 100