Table 4 Discriminant validity: DASH (n = 327), QuickDASH (n = 334), WORKDASH (n = 157) and SPAMDASH (n = 57) median (IQR) scores and differences between perceived disease activity groups
|  | Low disease activity (0–3) | Moderate disease activity (4–6) | High disease activity (7–10) | Chi-square | df | p |
|---|---|---|---|---|---|---|
DASH | 19.58 (9.58–36.32) | 42.81 (27.29–58.33) | 57.50 (43.33–72.50) | 399.40 | 332 | 0.007 |
QuickDASH | 15.91 (6.82–36.36) | 40.91 (25.00–52.27) | 56.82 (39.77–65.91) | 214.00 | 102 | 0.000 |
WORKDASH | 12.50 (0–29.69) | 28.13 (18.75–50.0) | 50.0 (31.25–68.75) | 71.37 | 28 | 0.000 |
SPAMDASH | 25 (0–37.5) | 56.25 (31.25–87.50) | 100 (75.00–100) | 50.02 | 28 | 0.006 |