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Positive predictive values of rectal bleeding for diagnosis of colorectal cancer, stratified for age
| Age group | Rectal bleeding
|
Positive predictive value (95% CI) | |
|---|---|---|---|
| All | With colorectal cancer | ||
| ⩾80 | 51 | 3 | 5.8 (1.2 to 16.2) |
| 70-79 | 66 | 14 | 21.2 (12.0 to 33.0) |
| 60-69 | 71 | 8 | 11.2 (5.0 to 21.0) |
| 50-59 | 57 | 1 | 1.7 (0 to 9.4) |
| <50 | 141 | 1 | 0.7 (0 to 4.9) |
| Total | 386 | 27 | 7 (4.6 to 10.0) |
