nsrr_ttldursp_s1s4 nsrr_ttllatsp_f1

Related Variables

visit Visit number

The Study of Osteoporotic Fractures (SOF) Visit where the data were collected/derived.

 		Administrative
period Polysomnography (PSG) Quality Assessment: Periodic breathing (5 min)

Scorer observed periodic breathing for a period of at least 5 minutes during study.

 		Sleep Monitoring/Polysomnography/Signal Quality
slp_eff Sleep Efficiency: the ratio of sleep duration (i.e. total sleep time) to in-bed period from type II polysomnography

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep (i.e. total sleep time, TST), while in-bed period is the interval between lights off/in-bed time and lights on/out-bed time (i.e. time in bed, TIB).

Percentage of time in bed that was spent sleeping, or the ratio of total sleep time to total time in bed, expressed as a percentage.

 		Sleep Monitoring/Polysomnography/Sleep Architecture