Table 1.
Distribution of patient characteristics by year of diagnosis using three time periods
| Variable | Level | 2002–2003 N = 1206 |
2004–2006 N = 1945 |
2007–2009 N = 1867 |
P-value |
|---|---|---|---|---|---|
| Age at diagnosis | Mean | 77.3 | 77.4 | 77.3 | 0.87 |
| Race | |||||
| White | 981 (81.3%) | 1513 (77.8%) | 1494 (80.0%) | 0.01 | |
| Black | 146 (12.1%) | 269 (13.8%) | 206 (11.0%) | ||
| Others | 79 (6.6%) | 163 (8.4%) | 167 (8.9%) | ||
| Comorbidity score | |||||
| 0 | 828 (68.7%) | 1294 (66.5%) | 1207 (64.6%) | 0.02 | |
| 1 | 252 (20.9%) | 382 (19.6%) | 406 (21.7%) | ||
| 2+ | 126 (10.4%) | 269 (13.8%) | 254 (13.6%) | ||
| Tumor size (mm) | |||||
| ≤20 | 125 (10.4%) | 325 (16.7%) | 304 (16.3%) | <0.0001 | |
| >20, ≤50 | 335 (27.8%) | 589 (30.3%) | 627 (33.6%) | ||
| >50 | 237 (19.7%) | 418 (21.5%) | 412 (22.1%) | ||
| Unknown | 509 (42.2%) | 613 (31.5%) | 524 (28.1%) | ||
| Region of patient's residence | |||||
| Midwest | 161 (13.3%) | 270 (13.9%) | 262 (14.0%) | 0.95 | |
| Northeast | 325 (26.9%) | 506 (26.0%) | 474 (25.4%) | ||
| South | 291 (24.1%) | 493 (25.3%) | 472 (25.3%) | ||
| West | 429 (35.6%) | 676 (34.8%) | 659 (35.3%) | ||
| Urban/rural residence | |||||
| Big metro | 676 (56.1%) | 1076 (55.3%) | 1036 (55.5%) | 0.23 | |
| Metro | 362 (30.0%) | 556 (28.6%) | 516 (27.6%) | ||
| Other | 168 (13.9%) | 313 (16.1%) | 315 (16.9%) | ||
| ER status | |||||
| Unknown | 459 (38.1%) | 486 (25.0%) | 382 (20.5%) | <0.0001 | |
| Positive | 557 (46.2%) | 1093 (56.2%) | 1136 (60.8%) | ||
| Negative | 190 (15.8%) | 366 (18.8%) | 349 (18.7%) | ||
| PR status | |||||
| Unknown | 490 (40.6%) | 520 (26.7%) | 408 (21.8%) | <0.0001 | |
| Positive | 405 (33.6%) | 830 (42.7%) | 871 (46.7%) | ||
| Negative | 311 (25.8%) | 595 (30.6%) | 588 (31.5%) | ||
| Hormone receptor | |||||
| Negative | 175 (14.5%) | 350 (18.0%) | 327 (17.5%) | <0.0001 | |
| Positive | 570 (47.3%) | 1108 (57.0%) | 1156 (61.9%) | ||
| Unknown | 461 (38.2%) | 487 (25.0%) | 384 (20.6%) | ||
| Chemotherapy | |||||
| No | 723 (60.0%) | 1228 (63.1%) | 1170 (62.7%) | 0.17 | |
| Yes | 483 (40.0%) | 717 (36.9%) | 697 (37.3%) | ||
| Radiation therapy | |||||
| No | 808 (67.0%) | 1293 (66.5%) | 1261 (67.5%) | 0.78 | |
| Yes | 398 (33.0%) | 652 (33.5%) | 606 (32.5%) | ||
| Surgery | |||||
| No | 720 (59.7%) | 1214 (62.4%) | 1272 (68.1%) | <0.001 | |
| Yes | 486 (40.3%) | 731 (37.6%) | 595 (31.9%) | ||
Values are given as n (%).
ER, estrogen receptor; PR, progesterone receptor.