The frequency of progesterone (PR) positivity, with respect to patient age, of 4056 breast carcinomas as determined by the immunohistochemical assay
| Age in years | No. cases PR positive (%) | Total no. of cases in each age group |
|---|---|---|
| <21 | 3 (100.00%) | 3 (0.08%) |
| 21–30 | 20 (50.00%) | 40 (0.96%) |
| 31–40 | 150 (51.37%) | 292 (7.06%) |
| 41–45 | 214 (63.50%) | 337 (8.34%) |
| 46–50 | 345 (63.42%) | 544 (13.25%) |
| 51–55 | 294 (56.54%) | 520 (12.69%) |
| 56–65 | 534 (55.74%) | 958 (23.66%) |
| 66–75 | 461 (59.41%) | 776 (19.32%) |
| >75 | 335 (57.17%) | 586 (14.66%) |
| Total | 2356 (58.10%) | 4056 (100%) |