Table 6. ER Status in Women Who Were Diagnosed With Breast Carcinoma Undergoing Annual, Biennial, and Less-Frequent-Than-Biennial Screening.
| ER status | Screening frequency |
Total | ||
|---|---|---|---|---|
| Annual | Biennial | Less frequent than biennial | ||
| Not determined | 350 (34.3%) | 60 (24.8%) | 10 (15.6%) | 420 (31.7%) |
| Negative | 99 (9.7%) | 29 (12.0%) | 9 (14.1%) | 137 (10.3%) |
| Positive | 572 (56.0%) | 153 (63.2%) | 45 (70.3%) | 770 (58.0%) |
| Total | 1,021 (100.0%) | 242 (100.0%) | 64 (100.0%) | 1,327 (100.0%) |
χ2 = 16.2, df = 4, P = 0.003. Cramer’s V = 0.08. ER: estrogen receptor.