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Results according to risk groups generated by classification and regression tree analysis
| Risk group* | No. of subjects with CRC/total | Median age at CRC onset, years | HR (95% CI) | P |
|---|---|---|---|---|
| Low risk (node 1) | 75/210 | 63 | 1.00 (reference) | |
| Moderate risk (nodes 2–4) | 123/227 | 50 | 2.19 (1.50–3.19) | 0.00005 |
| High risk (nodes 5–7) | 39/48 | 42 | 4.67 (3.16–6.92) | 1.02×10–14 |
| P for trend | 1.27×10–13 | |||
*See Figure 2 for nodes.
