Time dependent ethnic convergence in colorectal cancer survival in hawaii

BMC Cancer

Table 4 Determinants for Five-year Survival Among Three Cohorts of Colorectal Cancer Patients.

COHORT	VARIABLE	DEATH BY COLORECTAL CANCER				DEATH BY OTHER CAUSES
		β	s.e.	χ²(1)	e ^β	β	s.e.	χ²(1)	e ^β
1 1960–1974	Stage	1.28	.050	659.0*	3.61	0.35	.044	65.5*	1.42
	Year	-0.43	.071	36.6*	0.65	-0.04	.071	0.3	0.96
	Age	0.18	.025	50.4*	1.20	0.56	.025	521.2*	1.75
	Sex	-0.08	.066	1.5	0.92	-0.28	.056	25.6*	0.75
2 1975–1987	Stage	1.66	.037	2029.3*	5.25	0.29	.036	68.8*	1.34
	Year	-0.14	.064	4.8	0.87	0.05	.061	0.7	1.05
	Age	0.16	.020	64.2*	1.17	0.70	.022	997.9*	2.01
	Sex	-0.13	.047	7.4	0.88	-0.35	.045	61.3*	0.71
3 1988–2000	Stage	1.80	.037	2398.7*	6.07	0.37	.036	102.1*	1.44
	Year	-0.01	.052	0.1	0.99	0.37	.079	22.0*	1.45
	Age	0.16	.021	58.6*	1.17	0.58	.023	616.2*	1.79
	Sex	-0.10	.048	4.7	0.90	-0.29	.048	37.5*	0.75

Notes. Determinants for five-year survival among three cohorts of colorectal cancer patients by cause of death are provided. All values were obtained using the method of partial maximum likelihood estimation in Cox regression. β is the regression coefficient, and is equivalent to the log of the hazard ratio. s.e. is the standard error of the regression coefficient and is used for calculating chi-square, which in turn is used for determining the statistical significance of β. χ²(1) is the chi-square value with one degree of freedom (each variable provides a single degree of freedom) and is calculated as (β/s.e.)². e ^β is the hazard ratio and is interpreted in the standard fashion. For Year (of diagnosis) and Age, the parameters reflect the estimated change per 10-year increment. Sex is coded with male as the control. An asterisk indicates significance at the .0001 level; none of the others was significant within the experimentwise α-level set to .005.

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