Characteristics of the study group overall and by race
| Overall | African-American | White | p Value | |
|---|---|---|---|---|
| N=975 | N=162 | N=813 | ||
| Age at diagnosis, mean±SD | 63±12.4 | 62.5±12.6 | 63.1±12.4 | 0.59 |
| Follow-up (years), Median (Q1, Q3) | 11 (4.5, 22.4) | 9 (3, 19) | 12 (4.8, 22.7) | 0.0003 |
| Financial adequacy | 807 (82.8) | 108 (66.7) | 699 (86) | <0.0001 |
| Highest level of educational attainment, N (%) | ||||
| Less than high school | 375 (38.5) | 89 (54.9) | 286 (35.2) | <0.0001 |
| High school | 330 (33.8) | 33 (20.4) | 297 (36.5) | |
| College | 210 (21.5) | 32 (19.8) | 178 (21.9) | |
| Graduate | 60 (6.2) | 8 (4.9) | 52 (6.4) | |
| Body mass index (kg/m2), mean±SD | 26.3±5.3 | 28.2±5.4 | 25.9±5.1 | <0.0001 |
| Stage, N (%) | ||||
| Local | 523 (53.6) | 71 (43.8) | 452 (55.6) | 0.01 |
| Regional | 397 (40.7) | 78 (48.1) | 319 (39.2) | 0.04 |
| Remote | 55 (5.6) | 13 (8) | 42 (5.2) | 0.15 |
| Smoking, N (%); current smokers | 195 (20) | 37 (22.8) | 158 (19.4) | 0.32 |
| Breast cancer treatment, N (%) | ||||
| No surgery | 17 (1.7) | 6 (3.7) | 11 (1.4) | 0.04 |
| Partial mastectomy | 194 (19.9) | 29 (17.9) | 165 (20.3) | 0.49 |
| Modified radical mastectomy | 760 (77.9) | 126 (77.8) | 634 (78) | 0.95 |
| Number of lymph nodes involved, N (%) | ||||
| 0 | 443 (45.4) | 60 (37) | 383 (47.1) | 0.10 |
| 1–3 | 302 (31) | 57 (35.2) | 245 (30.1) | |
| ≥4 | 39 (4) | 10 (6.2) | 29 (3.6) | |
| Tumour size (mm), mean±SD | 33.7±25 | 38.2±26.2 | 32.8±24.7 | 0.01 |
| Comorbidity index, mean±SD | 2.2±1.5 | 2.2±1.6 | 2.2±1.5 | 0.91 |
| Functional limitations at 3 months after breast cancer diagnosis | ||||
| Number of functional limitations, mean±SD | 2.2±2.3 | 2.8±2.3 | 2.1±2.3 | 0.0003 |
| ≥1 functional limitation, N (%) | 682 (69.9) | 135 (83.3) | 547 (67.3) | <0.0001 |
| Functional decline between baseline and 12 months | ||||
| Number of functional limitations at month 12 but not at month 3, mean±SD | 0.4±1 | 0.6±1.4 | 0.4±0.9 | 0.03 |
| ≥1 additional functional limitation reported at month 12, N (%) | 212 (21.7) | 36 (22.2) | 176 (21.6) | 0.87 |
| Mortality, N (%) | ||||
| All cause | 753 (77.3) | 133 (82.6) | 620 (76.3) | 0.08 |
| Breast cancer specific | 317 (32.5) | 61 (37.7) | 256 (31.5) | 0.13 |
| Other cause | 436 (44.7) | 72 (44.4) | 364 (44.8) | 0.94 |