Analysis of cut-off values for ASAS Health Index (ASAS HI) scores to define health status
| ASAS HI cut-offs and external criterion | n (P+N) | 90% SP (SE/SP) | (0,1) (SE/SP) | AUC |
| Cut-off between ‘good’ and ‘moderate’ functioning | ||||
| Patient global, Likert very good/good versus all others | 1531 (624+907) | 3.0 (49.5/90.0) | 5.7 (73.5/75.9) | 0.81 |
| Patient global, NRS <3 | 1533 (435+1098) | 2.3 (46.2/90.5) | 5.0 (76.5/71.9) | 0.80 |
| Cut-off between ‘moderate’ and ‘poor’ functioning | ||||
| Patient global, Likert very poor/poor versus all others | 1531 (304+1227) | 12.0 (39.5/90.5) | 7.4 (79.3/67.6) | 0.80 |
| Patient global, NRS >6 | 1533 (425+1108) | 11.7 (34.3/89.6) | 7.4 (71.3/69.7) | 0.76 |
AUC, area under the curve; NRS, numerical rating scale; P+N, number of positive+negative results according to the external criterion; SE, sensitivity; SP, specificity; 90% SP, cut-off according to the 90% specificity criterion; (0,1), cut-off according to the closest point to (0,1) criterion.