Table 3. Multivariable Quantile Regression–Estimated Racial Difference in Time to Treatment Across Percentiles by Neoadjuvant Treatment Status for Women With a Diagnosis of Breast Cancer in the US Military Health System, 1998-2007.
| Treatment Interval, Percentile | Time by Race/Ethnicity (95% CI), d | Model-Estimated Difference (95% CI)a | |
|---|---|---|---|
| Non-Hispanic White | Non-Hispanic Black | ||
| Patients With Neoadjuvant Treatment | |||
| Time to neoadjuvant treatment | |||
| 25th | 13 (11.2 to 14.8) | 18 (13.2 to 22.8) | 4.3 (0.6 to 8.0)b |
| 50th | 22 (19.5 to 24.5) | 24 (20.1 to 27.8) | 3.5 (−0.9 to 7.8) |
| 75th | 32 (28.0 to 35.9) | 36 (30.9 to 41.1) | 2.3 (−3.2 to 7.8) |
| 90th | 50 (43.3 to 56.7) | 45 (36.7 to 53.3) | −2.8 (−12.1 to 6.6) |
| Time to surgery | |||
| 25th | 100 (91.5 to 108.5) | 91 (71.5 to 110.5) | −13.1 (−29.8 to 3.6) |
| 50th | 133 (127.0 to 138.9) | 142 (128.1 to 155.9) | −12.2 (−28.8 to 4.3) |
| 75th | 166 (157.4 to 174.6) | 177 (164.9 to 189.1) | 9.3 (−10.2 to 28.9) |
| 90th | 201 (187.5 to 214.4) | 214 (176.9 to 251.1) | 24.2 (−2.7 to 51.2) |
| Patients Without Neoadjuvant Treatment | |||
| Time to surgery | |||
| 25th | 6.0 (4.3 to 7.7) | 0.0 (−3.3 to 3.3) | 0.4 (−0.7 to 1.5) |
| 50th | 20.0 (19.4 to 20.6) | 20.0 (18.4 to 21.6) | 1.9 (0.3 to 3.5)b |
| 75th | 33.0 (31.7 to 34.3) | 34.0 (31.5 to 36.5) | 3.1 (0.8 to 5.4)b |
| 90th | 47.0 (45.1 to 48.9) | 52.0 (47.7 to 56.3) | 7.6 (3.5 to 11.7)b |
a
Model adjusted for age, marital status, active duty status, military service/sponsor branch, care source, benefit type, TRICARE region, year of diagnosis, tumor stage, tumor grade, hormone receptor status, surgery type, and comorbid conditions. (See the Study Variables subsection of the Methods section for a description of the variable levels.)
b
P < .05.