Table 1.

Demographics and health behavior of participants by different durations of DSM-IV insomnia disorder (n = 4047)^a

			Insomnia status
	Total		No insomnia		1–6 month insomnia disorder		6-month insomnia disorder		p-value for X 2
	n = 4047		n = 3794		n = 78		n = 160
	n	(%)	n	Rate (%)	n	Rate (%)	n	Rate (%)
Demographic data
Age (years)
≥75	1523	37.6	2371	94.4	46	1.8	94	3.7	0.65
<75	2524	62.4	1421	93.7	32	2.1	63	4.2
Gender
Male	2259	55.8	2150	95.6	30	1.3	68	3.0	<0.001
Female	1788	44.2	1643	92.3	8	2.7	89	5.0
Education
Illiterate	677	16.7	3162	94.2	63	1.9	131	3.9	0.83
Literate	3370	83.3	632	93.9	15	2.2	26	3.9
Marital status
Married	3008	74.3	2838	94.8	47	1.6	109	3.6	0.005
Single, divorced and widowed	1039	25.7	956	92.4	31	3.0	48	4.6
Living status
With others	3818	94.3	3583	94.3	74	1.9	144	3.8	0.35
Alone	229	5.7	211	92.5	4	1.8	13	5.7
Health behavior
Smoking
Not current smoker	3354	82.9	3139	94	67	2.0	135	4.0	0.44
Current smoker	693	17.1	655	95.2	11	1.6	22	3.2
Alcohol
Not current drinker	3675	90.9	3442	94.1	71	1.9	145	4.0	0.78
Current drinker	372	9.2	352	94.9	7	1.9	12	3.2

^aDue to missing data, total numbers of participants in some variables are different