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Association between tumour characteristics and ctDNA positivity
| Factor | Odds ratio (95% CI) | P value |
|---|---|---|
| Stage | < 0.001 | |
| I | 1 (reference) | |
| II | 12.5 (4.3–36.6) | |
| III | 16.6 (5.7–48) | |
| IV | 92.1 (16.5–513.8) | |
| Location | 0.004 | |
| Proximal colon | 1 (reference) | |
| Distal colon and rectum | 3.0 (1.4–6.2) |
