Table 1. Demographic and cancer characteristics of sample.
| Characteristic | N | % | ||
|---|---|---|---|---|
| Total | 72,461 | |||
| Age group | ||||
| 67-69 | 11,790 | 16.3% | ||
| 70-74 | 19,563 | 27.0% | ||
| 75-79 | 18,695 | 25.8% | ||
| 80-84 | 13,559 | 18.7% | ||
| 85+ | 8,854 | 12.2% | ||
| Race | ||||
| White | 65,190 | 90.0% | ||
| Black | 4,596 | 6.3% | ||
| Other | 2,675 | 3.7% | ||
| Marital Status | ||||
| Married | 30,983 | 42.8% | ||
| Unmarried | 38,688 | 53.4% | ||
| Other | 2,790 | 3.9% | ||
| Median income of zip code | ||||
| Less than $33,000 | 14,850 | 20.5% | ||
| $33,000-40,000 | 10,925 | 15.1% | ||
| $40,000-50,000 | 15,090 | 20.8% | ||
| $50,000-63,000 | 14,102 | 19.5% | ||
| More than $63,000 | 17,464 | 24.1% | ||
| Unknown | 30 | 0.0% | ||
| Comorbidity | ||||
| None | 33,462 | 46.2% | ||
| 1 to 2 | 27,851 | 38.4% | ||
| 3 or more | 11,148 | 15.4% | ||
| Stage | ||||
| I | 40,631 | 56.1% | ||
| II | 25,427 | 35.1% | ||
| III | 6,403 | 8.8% | ||
| Tumor size | ||||
| <2.0 cm | 44,076 | 60.8% | ||
| 2.0-<=5.0 cm | 24,133 | 33.3% | ||
| >5.0 cm | 3,669 | 5.1% | ||
| Missing | 583 | 0.8% | ||
| Grade | ||||
| Well differentiated | 17,255 | 23.8% | ||
| Moderately differentiated | 31,095 | 42.9% | ||
| Poorly differentiated | 18,561 | 25.6% | ||
| Undifferentiated | 716 | 1.0% | ||
| Unknown | 4,834 | 6.7% | ||
| Number positive lymph nodes | ||||
| No positive nodes | 45,679 | 63.0% | ||
| 1-3 positive nodes | 12,376 | 17.1% | ||
| 4+ positive modes | 5,713 | 7.9% | ||
| No nodes Examined | 8,374 | 11.6% | ||
| Unknown # Positive Nodes | 319 | 0.4% | ||
| Hormone receptors | ||||
| ER+ or PR+ | 56,114 | 77.4% | ||
| ER– and PR– | 9,063 | 12.5% | ||
| Missing | 7,284 | 10.1% | ||
| Bilateral Breast Cancer | ||||
| Yes | 1,951 | 2.7% | ||
| None | 70,510 | 97.3% | ||