Table 2. Relationship between histopathological features of invasive cancers and diagnostic screening episode. (A) Episode type by tumour size, LN status and grade and (B) proportion LN positive by grade and episode type.
| Prevalent, n (%) | Incident, n (%) | ||
|---|---|---|---|
| (A) a | |||
| Tumour size (mm) (n=948) | |||
| ⩽10 | 182 (31.4) | 175 (47.4) | P<0.001 |
| >10–⩽20 | 288 (49.8) | 145 (39.3) | |
| >20 | 109 (18.8) | 49 (13.3) | |
| LNs (n=829) | |||
| Negative | 355 (69.6) | 246 (77.1) | P=0.02 |
| Positive | 155 (30.4) | 73 (22.9) | |
| Grade (n=943) | |||
| 1 | 226 (38.9) | 150 (41.4) | P=0.7 |
| 2 | 233 (40.1) | 135 (37.3) | |
| 3 | 122 (21.0) | 77 (21.3) | |
| (B) b | |||
| Grade | Proportion LN positive | ||
| 1 | 46/182 (25.3) | 16/118 (13.6) | P=0.1 |
| 2 | 70/204 (34.3) | 32/121 (26.4) | |
| 3 | 39/113 (34.5) | 24/72 (33.3) | |
LN=lymph nodes.
a
P-values from Pearson χ2 test.
b
P-value represents grade by episode-type interaction tested using multiple logistic regression analysis of LN positivity.