Table 4.

Two-, three- and five-year survival for sampled black and matched white colon cancer patients in the sub-cohort analysis

Outcome Measure	Black Patients (n=2000)	Matched White Patients
		Matching including SES						Excluding SES
		Treatment-Match (n=2000)		Presentation-Match (n=2000)		Demographic-Match (n=2000)		Demographic-Match (n=2000)
Survival, median (95% CI), mo	64.6 (57.0–75.4)	70.6 (64.3–76.4)		70.1 (62.5–76.1)		90.3 (78.4–107.9)		96.9 (86.5–114.9)
2-yr Survival, % (95% CI)	67.7 (65.6–69.7)	71.4 (69.3–73.3)		71.3 (69.3–73.3)		73.6 (71.6–75.4)		74.2 (72.2–76.1)
Survival difference, %		3.7*	−0.1 (−1.5%)†	3.6*	2.3 (35.4%)#	5.9*	0.6 (9.2%)§	6.5*
P value		.012		.014		.0001		<.0001
3-yr Survival, % (95% CI)	61.7 (59.5–63.8)	64.1 (61.9–66.2)		64.6 (62.4–66.7)		66.1 (64.0–68.2)		67.9 (65.8–69.9)
Survival difference, %		2.4*	0.5 (8.1%)†	2.9*	1.5 (24.2%)#	4.4*	1.8 (29.0%)§	6.2*
P value		.12		.059		.004		<.0001
5-yr Survival, % (95% CI)	50.9 (48.5–53.2)	54.2 (51.9–56.4)		53.7 (51.4–56.0)		57.4 (55.1–59.7)		58.6 (56.3–60.8)
Survival difference, %		3.3*	−0.5 (−6.5%)†	2.8*	3.7 (48.1%)#	6.5*	1.2 (15.6%)§	7.7*
P value		.049		.090		.0001		<.0001
Cox HR (95% CI)	1 (reference)	0.90 (0.82–0.99)		0.91 (0.83–0.99)		0.82 (0.74–0.90)		0.79 (0.72–0.87)

mo: month; yr: year; CI: confidence interval; HR: hazard ratio; SES: socioeconomic status; significant effects (P<.05) in bold.

^*Survival differences between black and matched white patients.

^§The absolute difference (percentage) of survival disparity after demographic match explained by SES.

^#The absolute difference (percentage) of survival disparity after demographic match explained by SES and presentation.

^†The absolute difference (percentage) of survival disparity after demographic match explained by SES and treatment.