Table 2. Average FOBT Hb content observed in studied subjects with adenoma as the most severe lesion according to different subcategories (when multiple, only the adenoma largest in size or with most severe features was considered).
| Variable | Category | Average FOBT Hb content (ng m−l) | s.d. | Total cases | P-value (t test/ANOVA) |
|---|---|---|---|---|---|
| Size (cm) | <1 | 406.9 | 489.0 | 341 | 0.000 |
| 1–2 | 486.0 | 476.5 | 279 | ||
| >2 | 662.4 | 590.9 | 270 | ||
| Severe dysplasia | Present | 615.0 | 544.1 | 175 | 0.0001 |
| Absent | 483.3 | 521.9 | 715 | ||
| Histological type | Villous | 559.8 | 544.2 | 487 | 0.0002 |
| Tubular | 448.0 | 503.0 | 403 | ||
| Site (colon) | Left | 520.5 | 505.9 | 744 | 0.0037 |
| Right | 448.2 | 639.1 | 135 |
ANOVA=analysis of variance; FOBT=faecal occult blood testing; Hb=haemoglobin.