Table 2.

Factors of Colorectal cancer by using Cox regression.

Variables	Crude HR	95% CI		P	Adjusted HR	95% CI		P
Attention deficit- hyperactivity disorder
Without	Reference			0.001	Reference
With	3.556	1.700	7.480	0.001	3.458	1.640	7.293	0.001
Gender
Male	1.530	1.278	2.010	0.154	1.070	0.347	1.294	0.233
Female	Reference				Reference
Age group (years)
20–49	Reference				Reference
≧50	7.052	2.498	19.913	<0.001	6.887	2.371	20.005	<0.001
Insured premium (NT$)
<18,000	Reference				Reference
18,000–34,999	0.000	–	–	0.604	0.000	–	–	0.989
≧35,000	0.000	–	–	0.737	0.000	–	–	0.995
Location
Northern Taiwan	Reference				Multi-collinearity with urbanization level
Middle Taiwan	0.411	0.165	1.023	0.056	Multi-collinearity with urbanization level
Southern Taiwan	0.690	0.331	1.414	0.324	Multi-collinearity with urbanization level
Eastern Taiwan	0.257	0.034	1.916	0.185	Multi-collinearity with urbanization level
Outlets islands	0.000	–	–	0.979	Multi-collinearity with urbanization level
Urbanization level
1 (The highest)	4.155	0.944	18.287	0.060	4.298	0.712	25.944	0.129
2	3.754	0.627	22.467	0.147	3.227	0.712	14.632	0.126
3	3.927	0.915	16.683	0.660	3.413	0.707	16.466	0.112
4 (The lowest)	Reference				Reference
Level of care
Hospital center	2.748	1.025	7.363	0.044	1.896	0.645	5.578	0.245
Regional hospital	1.504	0.541	4.180	0.434	1.174	0.412	3.344	0.764
Local hospital	Reference				Reference

HR, hazard ratio; CI, confidence interval. Adjusted HR, adjusted for covariates in Table 1. NT$, New Taiwan Dollars.

P: Chi-square/Fisher exact test on category variables and t-test on continue variables.