Table 3.

Factors associated with stroke stratified by variables listed in the table by using Cox regression

Hypertensive pregnancy disorders	With			Without (Reference)			Ratio	Adjusted HR	95% CI	95% CI	P
Stratified	Events	PYs	Rate (per 105 PYs)	Events	PYs	Rate (per 105 PYs)
Total	198	163,208.79	121.32	698	654,982.30	106.57	1.138	2.134	1.817	2.505	< 0.001
Age group (years)
12–19	2	271.80	735.83	3	589.64	508.78	1.446	2.711	2.308	3.182	< 0.001
20–29	64	32,914.98	194.44	87	80,370.21	108.25	1.796	3.367	2.867	3.953	< 0.001
30–39	97	77,048.17	125.90	303	238,213.86	127.20	0.990	1.855	1.580	2.178	< 0.001
40–49	34	18,003.53	188.85	294	137,974.59	213.08	0.886	1.661	1.415	1.950	< 0.001
≧50	1	34,970.30	2.86	11	197,833.99	5.56	0.514	0.964	0.821	1.132	0.276
Insured premium (USD)
< 7200	191	125,404.75	152.31	688	466,665.85	147.43	1.033	1.937	1.649	2.273	< 0.001
7200-13,999	5	2344.91	213.23	8	8975.42	89.13	2.392	4.484	3.818	5.264	< 0.001
≥ 14,000	2	35,459.13	5.64	2	179,341.03	1.12	5.058	9.481	8.073	11.129	< 0.001
DM	20	8430.94	237.22	56	42,672.99	131.23	1.808	3.389	2.885	3.978	< 0.001
HTN	54	13,688.23	394.50	99	35,172.46	281.47	1.402	2.627	2.237	3.084	< 0.001
Hyperlipidemia	13	1980.06	656.55	42	8226.33	510.56	1.286	2.411	2.052	2.830	< 0.001
Obesity	1	477.68	209.35	1	2343.45	42.67	4.906	9.196	7.830	10.795	< 0.001
Heart disease	14	5039.75	277.79	75	33,325.22	225.05	1.234	2.314	1.970	2.716	< 0.001
CKD	6	2500.94	239.91	40	23,770.74	168.27	1.426	2.673	2.276	3.137	< 0.001
Season
Spring	52	30,039.53	173.11	146	109,482.26	133.35	1.298	2.433	2.072	2.856	< 0.001
Summer	40	32,853.28	121.75	175	126,710.16	138.11	0.882	1.653	1.407	1.940	< 0.001
Autumn	61	37,155.10	164.18	191	132,193.49	144.49	1.136	2.130	1.814	2.500	< 0.001
Winter	45	63,160.87	71.25	186	286,596.39	64.90	1.098	2.058	1.752	2.416	< 0.001
Urbanization level
1 (The highest)	75	43,701.39	171.62	225	153,595.67	146.49	1.172	2.196	1.870	2.578	< 0.001
2	83	57,996.46	143.11	294	210,128.07	139.91	1.023	1.917	1.633	2.251	< 0.001
3	16	10,060.20	159.04	40	46,748.29	85.56	1.859	3.484	2.967	4.090	< 0.001
4 (The lowest)	24	51,450.75	46.65	139	244,510.27	56.85	0.821	1.538	1.310	1.806	< 0.001
Level of care
Hospital center	96	43,471.31	220.84	301	142,056.49	211.89	1.042	1.954	1.663	2.293	< 0.001
Regional hospital	64	50,293.76	127.25	215	183,114.94	117.41	1.084	2.032	1.730	2.385	< 0.001
Local hospital	38	69,443.72	54.72	182	329,810.87	55.18	0.992	1.859	1.583	2.182	< 0.001

PYs Person-years; Adjusted HR Adjusted hazard ratio: Adjusted for the variables listed in Table 3; CI confidence interval