Table 2.

Sleep characteristics of the entire cohort (n = 4,957).

	Mean (SD)	Range
Total sleep time (min)	344.5 (87.2)	0–718
Sleep efficiency (%)	78.8 (66.3, 86.8)*	0–99.4
REM sleep (min)	60.0 (36.4)	0–210.1
REM sleep (% of total sleep)	16.9 (9.0)	0–60.8
Stage N3 sleep (min)	37.5 (34.8)	0–256.8
Stage N3 sleep (% of total sleep)	10.7 (9.7)	0–71.2
Sleep latency (min)	27.5 (30.1)	0–280.3

REM = rapid eye movement. *Median and interquartile range.