| Reader | Reader-specific cut-off level | Quartile (range of baseline scores in SHS units) (n patients) | Sensitivity (%) | Specificity (%) | κ | |
| SHS | SENS | |||||
| 1 | 2 | 1 | 1 (0–10) (61) | 100.0 | 65.0 | 0.56 |
| 2 (11–29) (62) | 100.0 | 77.1 | 0.60 | |||
| 3 (30–67) (64) | 83.3 | 84.6 | 0.57 | |||
| 4 (68–284) (64) | 66.7 | 95.9 | 0.67 | |||
| 2 | 3 | 1 | 1 (0–14) (47) | 33.3 | 72.7 | 0.02 |
| 2 (15–32) (47) | 75.0 | 94.9 | 0.70 | |||
| 3 (33–79) (47) | 90.9 | 91.7 | 0.78 | |||
| 4 (80–284) (48) | 91.7 | 86.1 | 0.70 | |||
n, number of patients; SHS, Sharp van der Heijde Score; SENS, Simplified Erosion Narrowing Score.