Table 1. Sociodemographic and health-related factors by self-reported sleep duration in the 45 and Up Study (N=212,388).

	<6 h	6 h	7 h	8 h	9 h	≥10 h	P
	N=7,311	N=25,487	N=50,979	N=86,502	N=25,616	N=16,493
Age (mean ± SD)	64.4 ± 11.9	61.6 ± 10.9	60.1 ± 10.1	61.7 ± 10.6	64.6 ± 11.2	68.6 ± 12.1	<0.001
Male gender (%)	41.8	46.3	48.1	46.2	47.7	53.8	<0.001
Tertiary education (%)	41.4	54.1	62.3	57.9	54.4	44.8	<0.001
Married (%)	61.3	70.3	77.1	78.0	77.9	69.0	<0.001
Urban residence (%)	47.6	49.7	49.7	43.5	39.0	39.7	<0.001
Private health insurance (%)	51.4	64.3	72.5	68.6	65.1	53.6	<0.001
Sufficient physical activity (%)	59.6	67.2	72.3	70.7	70.0	53.7	<0.001
Current smoker (%)	11.0	9.2	6.8	6.3	5.6	8.4	<0.001
Current drinker (>1 per day) (%)	23.6	27.9	32.5	33.3	35.3	31.1	<0.001
Obese (%)	25.3	23.1	19.3	19.8	19.7	25.1	<0.001
Existing illness/functional limitation (%)	55.5	38.9	29.6	34.2	43.0	65.3	<0.001