Discriminant ability of the ASAS Health Index (ASAS HI) with respect to disease activity and physical functioning
| Disease activity | F test | P values | ||||
| ASDAS thresholds | Inactive (n=245) | Moderate (n=283) | High (n=500) | Very high (n=289) | ||
| ASAS HI | 2.9 (3.1) | 5.1 (3.5) | 7.3 (3.6) | 10.4 (3.5) | 230. | <0.001 |
| BASDAI thresholds | <2.0 (n=372) | 2.0–3.9 (n=405) | 4.0–5.9 (n=347) | ≥6.0 (n=414) | ||
| ASAS HI | 2.8 (2.9) | 5.2 (3.1) | 7.8 (3.3) | 10.5 (3.4) | 421.4 | <0.001 |