Accuracy of CDAI to predict CRP normalisation at week 26
| CDAI week 26 cut-off | Sensitivity (%) | Specificity (%) | Overall accuracy (%) | Positive predictive value factor | Negative predictive value factor | Positive predictive value | Negative predictive value |
|---|---|---|---|---|---|---|---|
| <50 | 31.9 | 81.6 | 52.5 | 1.74 | 1.20 | 0.71 | 0.46 |
| <100 | 69.6 | 59.2 | 65.2 | 1.70 | 1.94 | 0.71 | 0.58 |
| <150 | 85.5 | 36.7 | 65.2 | 1.35 | 2.53 | 0.66 | 0.64 |
| <220 | 92.8 | 16.3 | 61.0 | 1.11 | 2.25 | 0.61 | 0.61 |
CDAI, Crohn's disease activity index; CRP, C-reactive protein.