Table 3. Relationship between ER status and Nottingham Prognostic Index (NPI).
| ER positive n (%) | ER negative n (%) | X2 | P | |
|---|---|---|---|---|
| NPI score | 12.081 | 0.002 | ||
| 2.00–3.40 | 221 (48.7) | 46 (32.9) | ||
| 3.41–5.40 | 208 (45.8) | 80 (57.1) | ||
| > 5.40 | 25 (5.5) | 14 (10.0) | ||
| Grade | 44.816 | 0.000 | ||
| High histological grade | 32 (7.4) | 39 (29.1) | ||
| Intermediate histological grade | 332 (76.9) | 83 (61.9) | ||
| Low histological grade | 68 (15.7) | 12 (9.0) | ||
| Tumor size | 4.019 | 0.403 | ||
| T1 | 238 (43.4) | 68 (39.8) | ||
| T2 | 269 (48.9) | 89 (52.0) | ||
| T3 | 16 (2.9) | 9 (5.3) | ||
| T4 | 26 (4.8) | 5 (2.9) | ||
| Lymph nodes | 1.405 | 0.495 | ||
| N0 | 256 (59.8) | 85 (64.4) | ||
| N1 | 170 (39.7) | 47 (35.6) | ||
| N2 | 2 (0.5) | 0 (0.0) |