Table 4.

Cox proportional hazards model: Metastatic disease testing within 18 months of treatment, among colorectal cancer survivors.

	Hazard Ratio (95% CI)	P-value
Sociodemographic factors
Age at diagnosis
< 50 years	1.31 (1.06–1.63)	0.01
50–64 years	1.25 (1.10–1.42)	<0.01
65–74 years	1.11 (0.98–1.26)	0.10
≥ 75 years	reference	-
Female	1.08 (0.98–1.19)	0.13
White	1.08 (0.95–1.24)	0.25
Median household income ($1000s)	1.00 (1.00–1.00)	0.55
Disease stage
In situ	0.30 (0.22–0.40)	<0.01
Localized	0.60 (0.54–0.67)	<0.01
Regional	reference	-
Charlson comorbidity index	1.10 (1.07–1.14)	<0.01
Site of care
Health plan 1	1.78 (1.53–2.07)	<0.01
Health plan 2	1.07 (0.94–1.21)	0.29
Health plan 3	0.88 (0.75–1.03)	0.11
Health plan 4	reference	-

χ² = 225.6, 12 df (p < 0.001).