Table 3 Dimension characteristics of the SUMD
Dimension/index (number of items) | M (SD) | Missing values % | Item-internal consistency (min-max) | Item discriminant validity (min-max) | Floor % | Ceiling % | Alpha* | INFIT** (min-max) |
|---|---|---|---|---|---|---|---|---|
Model 1 scoring: ‘not applicable’ = ‘0’ | ||||||||
Awareness of disease (3) | 55.3 (22.1) | 0.13 | 0.81–0.90 | 0.32–0.44 | 4.5 | 17.1 | 0.83 | 0.86–1.15 |
Awareness of positive symptoms (3) | 47.2 (27.2) | 0.70 | 0.79–0.85 | 0.37–0.48 | 22.3 | 15.3 | 0.76 | 0.88–1.09 |
Awareness of negative symptoms (3) | 47.5 (25.4) | 0.53 | 0.81–0.87 | 0.31–0.44 | 16.8 | 11.3 | 0.80 | 0.87–1.12 |
Index (9) | 50.0 (20.0) | 0.45 | NA*** | NA*** | NA*** | NA*** | 0.85 | NA*** |
Model 2 scoring: ‘not applicable’ = missing data | ||||||||
Awareness of disease (3) | 56.20 (22.0) | 1.6 | 0.82–0.93 | 0.43–0.70 | 48.2 | 17.1 | 0.87 | 0.73–1.39 |
Awareness of positive symptoms (3) | 59.83 (19.6) | 23.0 | 0.82–0.88 | 0.52–0.68 | 28.5 | 15.3 | 0.82 | 0.93–1.10 |
Awareness of negative symptoms (3) | 57.45 (19.4) | 15.5 | 0.85-0.90 | 0.43–0.67 | 35.2 | 11.4 | 0.85 | 0.81–1.14 |
Index (9) | 57.83 (17.8) | 13.4 | NA*** | NA*** | NA*** | NA*** | 0.85 | NA*** |