Table 5.

Quantile regression estimated median time-to-treatment (95% confidence intervals [CI]) and difference in median time-to-treatment between non-Hispanic white and non-Hispanic black adults with colon cancer, stratified by age at diagnosis

Stage group, treatment, and treatment interval	Age at diagnosis
	Age <50 y					Age ≥50 y
	Non-Hispanic white		Non-Hispanic black		Model-estimated difference*	Non-Hispanic white		Non-Hispanic black		Model-estimated difference*
	No.	Time-to-treatment, d (95% CI)	No.	Time-to- treatment, d (95% CI)		No.	Time-to-treatment, d (95% CI)	No.	Time-to-treatment, d (95% CI)
Stages I and stage II (low risk)
Surgery
Diagnosis–surgery	134	6.0 (1.4 to 10.6)	51	7.0 (0.4 to 13.6)	0.0 (−4.6 to 4.6)	788	7.0 (4.9 to 9.1)	185	11.0 (5.7 to 16.3)	1.1 (−2.7 to 4.9)
Stage II (high risk) and stage III
Surgery only
Diagnosis–surgery	21	4.0 (−5.2 to 13.2)	9	13.0 (−2.3 to 28.3)	—†	241	4.0 (1.0 to 7.0)	57	7.0 (1.7 to 12.2)	3.0 (−1.5 to 7.5)
Surgery and adjuvant chemotherapy	178		83			515		128
Diagnosis-surgery		6.0 (3.0 to 9.0)		6.0 (1.9 to 10.1)	−2.2 (−6.0 to 1.7)		7.0 (4.9 to 9.1)		7.0 (3.9 to 10.1)	−2.0 (−5.6 to 1.5)
Surgery–chemo		41.0 (38.7 to 43.3)		46.0 (42.5 to 49.5)	5.1 (−0.6 to 10.8)		43.0 (41.3 to 44.7)		42.0 (38.5 to 45.5)	0.2 (−4.3 to 4.6)
Stage IV
Surgery or chemotherapy
Diagnosis–treatment	121	8.0 (3.9 to 12.1)	67	7.0 (0.9 to 13.1)	0.9 (−5.4 to 7.3)	353	10.0 (7.0 to 13.0)	136	7.0 (3.3 to 10.7)	−1.7 (−5.8 to 2.4)

^*Difference modeled is non-Hispanic black compared with non-Hispanic white as the reference group. Regression model adjusted for sex, marital status, military service branch, active-duty status, benefit type, care source, geographic region, year of diagnosis, tumor stage (except model including stage IV only), and Charlson and gastrointestinal comorbid conditions. CI = confidence interval.

^†Small size (n = 30) precluded reliable adjusted estimate.