Table 4.

Factors of suicide attempts stratified by variables listed in the table by Cox proportional hazard model analysis

Variables	With insomnia			Without insomnia			Ratio	Adjusted HR	95%CI		P-value
	Event	PYs	Rate (per 103 PYs)	Event	PYs	Rate (per 103 PYs)
Total	1098	953,594	115.143	297	1,913,519	15.521	7.418	3.533	3.059	4.080	< 0.001
Gender
female	633	468,954	134.981	153	941,910	16.244	8.310	4.186	3.429	5.111	< 0.001
male	465	484,640	95.948	144	971,609	14.821	6.474	2.861	2.323	3.523	< 0.001
Age group (years)
15–24	119	42,625	279.179	33	85,435	38.626	7.228	2.778	1.747	4.417	< 0.001
25–44	546	198,523	275.031	80	400,512	19.974	13.769	5.546	4.236	7.262	< 0.001
45–64	264	317,825	83.065	105	637,466	16.471	5.043	2.637	2.053	3.389	< 0.001
≧65	169	394,621	42.826	79	790,106	9.999	4.283	2.900	2.188	3.844	< 0.001
Low income
no	987	915,626	107.795	288	1,884,404	15.283	7.053	3.487	3.009	4.040	< 0.001
yes	111	37,968	292.351	9	29,115	30.912	9.458	4.069	2.012	8.228	< 0.001
Catastrophic illness
no	635	645,939	98.306	220	1,504,259	14.625	6.722	3.769	3.171	4.479	< 0.001
yes	463	307,655	150.493	77	409,260	18.814	7.999	2.916	2.255	3.770	< 0.001
Urbanization
high	291	243,831	119.345	84	661,398	12.700	9.397	3.911	2.964	5.161	< 0.001
medium	398	369,572	107.692	132	835,185	15.805	6.814	3.320	2.655	4.153	< 0.001
low	409	340,191	120.227	81	416,936	19.427	6.188	3.355	2.592	4.342	< 0.001
Drug dependence
no	1044	942,877	110.725	292	1,910,198	15.286	7.243	3.569	3.086	4.127	< 0.001
yes	54	10,717	503.872	5	3321	150.557	3.347	2.079	0.817	5.286	0.207
Alcohol dependence
no	978	916,596	106.699	288	1,899,319	15.163	7.037	3.513	3.032	4.072	< 0.001
yes	120	36,998	324.342	9	14,200	63.380	5.117	3.844	1.936	7.634	< 0.001
Mental disorders
no	300	618,043	48.540	181	1,763,589	10.263	4.730	4.798	3.968	5.801	< 0.001
yes	798	335,551	237.818	116	149,930	77.369	3.074	2.223	1.823	2.711	< 0.001