Table 6.
Likelihood ratio for positive result (LR+), likelihood ratio for negative result (LR-) and its inverse (1/LR-), posttest odds ratio (posttest OR), and probability following tests (posttest P) of Crohn’s disease activity for each noninvasive marker exam and their respective cut-offs
| LR+ | LR- | 1/LR- | Posttest OR | Posttest P | |
|---|---|---|---|---|---|
| fCal≥155 mcg/g | 1.73 | 0.08 | 11.69 | 3.36 | 0.77 |
| fCal≥199 mcg/g | 1.74 | 0.20 | 5.01 | 3.38 | 0.77 |
| fCal≥246 mcg/g | 1.83 | 0.22 | 4.49 | 3.56 | 0.78 |
| fCal≥273 mcg/g | 1.95 | 0.24 | 4.12 | 3.77 | 0.79 |
| fCal≥1009 mcg/g | 3.50 | 0.56 | 1.77 | 6.80 | 0.87 |
| fCal≥ 1473 mcg/g | 5.45 | 0.64 | 1.55 | 10.58 | 0.91 |
| CRP ≥ 6.7 mg/L | 2.25 | 0.38 | 2.66 | 4.36 | 0.81 |
| Pla ≥ 292,500/mm3 | 1.96 | 0.51 | 1.92 | 3.80 | 0.79 |
fCal Faecal calprotectin, CRP Serum C-reactive protein, Pla Platelet count, LR+ Likelihood ratio for positive result, LR- Likelihood ratio for negative result, 1/LR- Likelihood ratio in patients in remission, OR odds ratio, Posttest P Posttest probability of CD activity