Table 3.
Diagnostic power of the pulleys thickening vs the final diagnosis provided by the treating rheumatologist after 12 months
| Cases (%) (N = 86) | Controls (%) (N = 120) | Sensitivity % | Specificity % | LR+ | LR− | PPV | NPV | |
|---|---|---|---|---|---|---|---|---|
| Psoriatic arthritis | 40 (46.5) | 10 (8.3) | 80.0 | 71.0 | 2.71 | 0.28 | 46.5 | 91.7 |
| Rheumatoid arthritis | 11 (12.8) | 34 (28.3) | 24.4 | 53.4 | 0.52 | 1.41 | 12.8 | 71.7 |
| Osteoarthritis | 12 (14.0) | 39 (32.5) | 23.5 | 48.9 | 0.46 | 1.56 | 14.0 | 64.6 |
| Undifferentiated arthritis | 20 (23.3) | 25 (20.8) | – | – | – | – | – | – |
| Other/negative | 3 (3.5) | 12 (10.0) | – | – | – | – | – | – |
LR+ positive likelihood ratio, LR− negative likelihood ratio, PPV positive predictive value, NPV negative predictive value