EASi-QoL (20-item) item and scale properties at baseline (n = 612).
| Missing, % | Mean (SD) | Response Options | Item-Total Correlation (domain) | Cronbach alpha (ICC) | ||
|---|---|---|---|---|---|---|
| EASi-QoL* | Floor, % | Ceiling, % | ||||
| Domain 1: Physical function (0–24) | 0.7 | 8.50 (5.96) | 5.5 | 0.2 | — | 0.90 (0.93) |
| Item 1 (1) Lifting | 0.5 | 1.80 (1.25) | 16.6 | 10.8 | 0.78 | — |
| Item 2 (2) Walking | 0.5 | 1.52 (1.56) | 41.5 | 18.6 | 0.80 | — |
| Item 3 (5) Standing | 0.7 | 1.63 (1.36) | 27.1 | 11.5 | 0.79 | — |
| Item 4 (11) Getting up from sitting | 0.5 | 1.33 (1.02) | 22.7 | 1.8 | 0.72 | — |
| Item 5 (12) Find comfy position | 0.5 | 1.47 (1.02) | 17.2 | 2.1 | 0.71 | — |
| Item 6 (17) Dressing | 0.2 | 0.75 (0.91) | 49.9 | 0.5 | 0.73 | — |
| Domain 2: Disease activity (0–16) | 0.2 | 7.86 (4.11) | 1.6 | 4.6 | — | 0.88 (0.88) |
| Item 7 (28) Pain | 0.2 | 2.02 (1.05) | 4.3 | 8.3 | 0.81 | — |
| Item 8 (30) Sleep | 0.2 | 1.69 (1.29) | 21.6 | 9.8 | 0.77 | — |
| Item 9 (31) Energy | 0.2 | 2.09 (1.25) | 12.1 | 15.7 | 0.71 | — |
| Item 10 (34) Stiffness | 0.2 | 2.06 (1.18) | 8.2 | 11.5 | 0.72 | — |
| Domain 3: Emotional well-being (0–20) | 0 | 6.27 (5.11) | 12.2 | 0.7 | — | 0.91 (0.90) |
| Item 11 (22) Embarrassed | 0.2 | 0.98 (1.19) | 48.3 | 4.7 | 0.66 | — |
| Item 12 (27) Worry about future | 0.2 | 1.52 (1.29) | 26.8 | 9.8 | 0.80 | — |
| Item 13 (32) Concentration | 0 | 1.05 (1.09) | 40.2 | 1.0 | 0.76 | — |
| Item 14 (33) Drive and motivation | 0 | 1.48 (1.20) | 26.6 | 4.7 | 0.82 | — |
| Item 15 (40) Downhearted | 0.2 | 1.23 (1.18) | 35.0 | 4.7 | 0.84 | — |
| Domain 4: Social participation (0–20) | 0.2 | 7.15 (5.25) | 8.9 | 0.7 | — | 0.92 (0.90) |
| Item 16 (18) Interfere with work | 0.3 | 1.60 (1.21) | 21.8 | 7.5 | 0.82 | — |
| Item 17 (21) Family life | 0.2 | 0.97 (1.15) | 46.3 | 2.1 | 0.78 | — |
| Item 18 (24) Travel by car | 0.5 | 1.08 (1.15) | 41.5 | 2.8 | 0.74 | — |
| Item 19 (37) Keep physically active | 0 | 1.70 (1.26) | 19.9 | 8.8 | 0.82 | — |
| Item 20 (42) Quality of life | 0.2 | 1.82 (1.29) | 17.3 | 13.3 | 0.82 | — |
↵* EASi-QoL scoring: Scores are computed by summing the items where no more than one item per relevant domain is missing. Domain mean scores are imputed for missing items. Items are scored 0–4. Lower scores indicate better health-related quality of life.