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Number and percentages of rats with and without mammary tumors in the three groups.
| Without tumors |
With tumors |
% | Regressed tumors |
% | Necrotic tumors |
% | Regular tumors |
% | |
|---|---|---|---|---|---|---|---|---|---|
| Nulliparous | 12 | 30 | 71.4 | 0 | 0 | 0 | 0 | 30 | 100 |
| Pregnancy-lactation | 35 | 47 | 57.3 | 17 | 36.2∗ | 11 | 23.4∗ | 19 | 40.4 |
| Implanted | 11 | 26 | 70.3 | 0 | 0 | 0 | 0 | 26 | 100 |
∗ P < 0.05 compared to Nulliparous or Implanted rats.
