Table 3 Psychometric properties of the German version of the WRFQ and its subscales
From: Evaluation of measurement properties of the German Work Role Functioning Questionnaire
T0 (n = 653) | T0-T1 (n = 66) | T0-T2 (n = 96) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Scale/ subscale | Mean (SD) a) | N (%) at floor (0%) | N (%) at ceiling (100%) | Cronbach’s α | ICC (CI95%) | Inter-item correlation (mean (SD)) | Item-to-total correlation | Mean (SD) T0/T1 | ICC | SEM | Mean (SD) T0/T2 | Mean change T0-T2 (SD) | SRM |
WRFQ(total) | 71.2 (17.4) | 0 (0%) | 0 (0%) | 0.94 | 0.94 (0.93–0.95) | 0.37 (0.14) | 0.43–0.73 | 69.8 (17.5)/ 77.3 (16.6) | 0.80 | 0.63 | 72.6 (15.5)/ 54.6 (13.0) | −17.96 (13.36) | 1.34 |
WRFQ-F1 Work scheduling and output demands (10 items) | 68.7 (21.8) | 0 (0%) | 16 (2.5%) | 0.89 | 0.89 (0.88–0.90) | 0.44 (0.18) | 0.48–0.76 | 68.2 (20.7)/ 73.7 (19.8) | 0.77 | 0.63 | 71.2 (20.3)/ 50.3 (16.7) | −20.86 (17.62) | 1.18 |
WRFQ-F2 Physical demands (5 items) | 69.2 (22.8) | 1 (0.2%) | 83 (12.7%) | 0.79 | 0.78 (0.76–0.81) | 0.43 (0.009) | 0.45–0.65 | 65.8 (23.0)/ 77.3 (19.7) | 0.44 | 2.38 | 66.8 (23.8)/ 53.1 (18.6) | −18.05 (23.42) | 0.77 |
WRFQ-F3 Mental and social demands (7 items) | 74.0 (19.8) | 1 (0.2%) | 41 (6.3%) | 0.87 | 0.87 (0.86–89) | 0.50 (0.02) | 0.46–0.81 | 72.9 (21.2)/ 78.5 (18.9) | 0.67 | 1.62 | 75.9 (18.1)/ 58.2 (15.2) | −12.95 (20.52) | 0.63 |
WRFQ-F4 Flexibility demands (5 items) | 75.0 (21.3) | 6 (0.9%) | 88 (13.5%) | 0.85 | 0.85 (0.83–0.87) | 0.53 (0.003) | 0.59–0.70 | 74.7 (23.4)/ 82.6 (20.6) | 0.65 | 1.95 | 77.5 (19.9)/ 59.8 (16.7) | −11.33 (23.25) | 0.49 |