The diagnostic value of symptom combinations and the characteristics of proctocolitis in primary care.
| Symptoms | Numbers | Predictive value | Likelihood ratio (95% CI) | Sensitivity | Specificity |
|---|---|---|---|---|---|
| Bleeding and CIBH | 5/119 | 4.2 | 1.901 (1.295 to 2.789) | 83 | 56 |
| Bleeding and no CIBH | 1/147 | 0.7 | |||
| Bleeding and CIBH (loose +/− frequent) | 5/83 | 6.0 | 1.207 (0.827 to 1.763) | 83 | 31 |
| Bleeding and CIBH (hard +/− infrequent) | 1/36 | 2.8 | |||
| Bleeding and no perianal symptoms | 6/63 | 9.5 | 4.561 (3.626 to 5.737) | 100 | 76.3 |
| Bleeding and perianal symptoms | 0/203 | 0 | |||
| Bleeding, CIBH and abdominal pain | 1/67 | 1.5 | 0.355 (0.061 to 2.061) | 20 | 42 |
| Bleeding, CIBH and no abdominal pain | 4/52 | 7.7 | |||
| Dark blood | 1/31 | 3.2 | 1.5 (0.252 to 8.934) | 20 | 86 |
| Bright blood | 4/199 | 2 | |||
Total proctocolitis in study: 6/319, 1.9%. Diagnostic yield for proctocolitis in patients sigmoidoscoped: 16/219, 2.7% [95% CI = 1.1 to 6.1]). CIBH = change in bowel habit.