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. Author manuscript; available in PMC: 2014 Aug 30.
Published in final edited form as: Stat Med. 2013 Jan 24;32(19):3342–3356. doi: 10.1002/sim.5747

Table 1.

Demographic covariates and sleep variables, means of the two groups. All measures are not significantly different (RDI is different by design).

Variable SDB no-SDB p-value
RDI (events/hour) 40.532 2.114 0.000
BMI (kg/m2) 30.275 30.247 0.972
Age (years) 61.804 61.804 1.000
Race (% white) 92.160 92.160 1.000
Sex (% male) 66.667 66.667 1.000
Total Sleep Time (min.) 351.397 357.466 0.593
% Total Sleep Time asleep 81.941 83.364 0.743