3.

Hazard ratios (95%CI) for lung cancer according to average sleep duration in Physicians' Health Study

Sleep duration (h)	Cases/personyears	Crude incidence rate (per 1, 000 person-yrs)	Hazards ratio (95%CI)
			Unadjusted	Model 1	Model 2
Model 1: Age (< 60, 60- < 65, 65- < 70, 70- < 75, 75+) and race (white/non-white). Model 2: Age (< 60, 60- < 65, 65- < 70, 70- < 75, 75+), race (white/non-white), parental history of cancer (yes/no), exercise frequency (Never/Rarely, 1-3/mo, 1-4/wk, 5-7/wk), caloric intake (tertiles), body mass index (continuous), type 2 diabetes (yes/no), alcohol consumption (< 1/wk, 1-4/ wk, 5-7/wk, > 7/wk), smoking status (never, past, current), sleep apnea (yes/no), and snoring (mostly/always, few/occasionally, rarely/never, unknown/missing), alcohol consumption (< 1/wk, 1-4/wk, 5-7/wk, > 7/wk), smoking status (never, past, current), sleep apnea (yes/no), and snoring (mostly/always, few/occasionally, rarely/never, unknown/missing).
≤6.0	35/40, 582	0.86	1.08 (0.71-1.66)	1.25 (0.82-1.92)	1.18 (0.77-1.82)
7.0	53/66, 352	0.80	1.0	1.0	1.0
≥8.0	62/51, 345	1.21	1.52 (1.05-2.19)	1.11 (0.76-1.60)	0.97 (0.67-1.41)
P for quadratic trend			0.155	0.348	0.697