Table 2.

Prevalence of DSM-IV insomnia disorder with different durations in various medical conditions (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 (%)
Medical conditions
No medical conditions	1161	28.8	1133	97.6	9	0.8	19	1.6	<0.001
Any medical conditions	2868	71.2	2661	92.8	69	2.4	138	4.8
Chronic diseasesb
Diabetes mellitus
No diabetes mellitus	3523	87.1	3304	94.3	67	1.9	134	3.8	0.78
Diabetes mellitus	524	12.9	490	93.5	11	2.1	23	4.4
Hypertension
No hypertension	2467	61.0	2323	94.5	44	1.8	91	3.7	0.50
Hypertension	1580	39.0	1471	93.6	34	2.2	66	4.2
Heart disease
No heart disease	3258	80.5	3074	94.8	62	1.9	107	3.3	<0.001
Heart disease	789	19.5	720	91.6	16	2.0	50	6.4
Stroke
No stroke	3895	96.2	3660	94.4	74	1.9	143	3.7	0.002
Stroke	152	3.8	134	88.2	4	2.6	14	9.2
Gouty arthritis
No gouty arthritis	3735	92.3	3505	94.2	72	1.9	142	3.8	0.67
Gouty arthritis	312	7.7	289	93.2	6	1.9	15	4.8
Pulmonary diseases
No pulmonary diseases	3584	88.6	3375	94.6	61	1.7	130	3.6	0.001
Pulmonary diseases	463	9.8	419	90.5	17	3.7	27	5.8
Depression
Geriatric depression scale <5	3612	89.3	3437	95.5	60	1.7	102	2.8	<0.001
Geriatric depression scale ≥5	396	9.8	324	82.0	17	4.3	54	13.7
Clinical conditions
Excessive daytime sleepiness
No	3602	89.0	3395	94.6	64	1.8	131	3.6	0.01
Yes	445	11.0	399	90.9	14	3.2	26	5.9
Pain
No	2660	66.2	2534	95.3	45	1.7	81	3.0	<0.001
Mild	1070	26.6	1004	93.8	21	2.0	45	4.2
Moderate	191	4.7	163	85.3	10	5.2	18	9.4
Severe	103	2.6	88	85.4	2	1.9	13	12.6
Fall
No fall	3491	86.3	3294	94.8	59	1.7	121	3.5	0.001
Single fall	398	9.8	361	90.7	13	3.3	24	6.0
Repeated falls	134	3.3	119	88.8	4	3.0	11	8.2

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

^bChronic diseases were defined as pharmacologically-treated morbidities