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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
  1. Abbreviations: CI Confidence interval, ICC Intraclass coefficient, SD Standard deviation, SEM Standard error of measurement (SDdiff/√2), SRM Standardized response mean (ratio between mean change score and its SD)
  2. Floor and ceiling effects and internal consistency (T0), reproducibility by reliability and test-retest reliability (T1) and responsiveness (T2)
  3. a Range 0–100 (lowest to best work role functioning) in all scales