Table 2 Psychometric properties of the FPQ scales
Participation in social life FPQ-S (11 items) | Participation in daily life FPQ-D (11 items) | Participation in work-life FPQ-W 1(5 items) | |
|---|---|---|---|
Distribution properties | |||
Mean percentage of missing values and ‘not applicable’ (%) | 8.1 | 4.3 | 4.1 |
Scale mean (sum score, 0–100, 100 = best possible participation) (mean, standard deviation, N) | 39.2 (21.2) N = 223 | 60.3 (20.6) N = 239 | 34.6 (21.3) N = 184 |
Unidimensionality | |||
Fit values | CFI = 0.943 | CFI = 0.944 | CFI = 0.985 |
TLI = 0.929 | TLI = 0.930 | TLI = 0.969 | |
RMSEA = 0.099 | RMSEA = 0.089 | RMSEA = 0.106 | |
SRMR = 0.042 | SRMR = 0.046 | SRMR = 0.025 | |
Local independence | |||
Percentage of residual correlations >0.10 (%) | 9.1 | 7.3 | 30.0 |
Percentage of residual correlations >0.20 (%) | 0 | 0 | 0 |
IRT analysis | |||
Number of items with poor item fit (infit or outfit <0.6 or >1.4) | 0 | 0 | 2 |
Reliability | |||
Cronbach’s Alpha | 0.94 | 0.93 | 0.85 |
Person separation index | 0.91 | 0.90 | 0.91 |
Differential item functioning | |||
Number of items with DIF | 0 | 0 | 0 |