# 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
1. 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.