Discriminating capacity of the hand function indices in relation to the 2 patient groups with minor and major extent of organ involvement.
| Model | C-Index (95% CI) | Best Cutoff for Classifying Major Extent of Organ Involvement | Sensitivity | Specificity |
|---|---|---|---|---|
| HAI | 0.80 (0.66–0.91) | ≤ 2.6 | 79 | 79 |
| HAMIS | 0.81 (0.69–0.91) | ≥ 4.5 | 63 | 89 |
| FTP | 0.73 (0.60–0.87) | ≥ 1.5 | 58 | 82 |
| HAI + FTP | 0.84 (0.73–0.93) | HAI ≤ 2.5, FTP ≥ 1 | 74 | 80 |
| FTP + HAMIS | 0.82 (0.71–0.92) | HAMIS ≥ 2.5, FTP ≥ 1 | 79 | 71 |
| HAI + HAMIS | 0.83 (0.72–0.94) | HAI ≤ 2.5, HAMIS ≥ 2.5 | 79 | 85 |
| HAI + HAMIS + FTP | 0.85 (0.74–0.95) | HAMIS ≥ 4.5, HAI ≤ 2.6, FTP ≥ 0.5 | 84 | 79 |
HAI: Hand Anatomic Index; HAMIS: Hand Mobility in Scleroderma; FTP: finger-to-palm distance.