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Table 3 Construct validity, reliability, and responsiveness of the C-WORCC-WORC

From: Cross-cultural translation of the Western Ontario Cuff Index in Chinese and its validation in patients with rotator cuff disorders

Parameter C-WORC subscale (No. items)
Physical symptom (6) Sports/ Recreation (4) Work (4) Lifestyle (4) Emotions (3) Overall
scale (21)
Construct validity indicated by correlation coefficient r r s (P value) with indicated instruments a,b
OSS 0.774 (<0.001) 0.787 (<0.001) 0.732 (<0.001) 0.672 (<0.001) 0.242 (0.007) 0.842 (<0.001)
SF-36
Physical function 0.523 (<0.001) 0.580 (<0.001) 0.532 (<0.001) 0.472 (<0.001) 0.242 (0.007) 0.568 (<0.001)
Role physical 0.514 (<0.001) 0.598 (<0.001) 0.622 (<0.001) 0.532 (<0.001) 0.144 (0.111) 0.605 (<0.001)
Bodily pain 0.623 (<0.001) 0.655 (<0.001) 0.621 (<0.001) 0.594 (<0.001) 0.289 (0.001) 0.663 (<0.001)
General health 0.540 (<0.001) 0.497 (<0.001) 0.510 (<0.001) 0.485 (<0.001) 0.126 (0.165) 0.579 (<0.001)
Vitality 0.180 (0.045) 0.219 (0.015) 0.183 (0.042) 0.181 (0.045) 0.583 (<0.001) 0.248 (0.006)
Social function 0.286 (0.001) 0.309 (<0.001) 0.350 (<0.001) 0.222 (0.013) 0.520 (<0.001) 0.326 (0.001)
Role emotional 0.350 (<0.001) 0.368 (<0.001) 0.226 (0.011) 0.275 (0.002) 0.713 (<0.001) 0.391 (<0.001)
Mental health 0.321 (<0.001) 0.342 (<0.001) 0.352 (<0.001) 0.261 (0.003) 0.571 (<0.001) 0.366 (<0.001)
Test-retest reliability, mean (SD) or ICC value (CI range) b
Test score 40.2 (15.1) 33.2 (13.6) 30.9 (15.0) 38.1 (16.3) 42.9 (26.6) 37.1 (13.4)
Retest score 40.1 (16.3) 33.1 (15.7) 30.7 (17.3) 38.0 (17.4) 42.7 (27.0) 36.9 (15.0)
Score change −0.1 (5.9) −0.1 (7.1) −0.2 (9.5) −0.1 (4.7) −0.2 (8.8) −0.1 (6.6)
ICC (95% CI) 0.930 (0.902–0.951) 0.885 (0.840–0.918) 0.828 (0.763–0.866) 0.961 (0.945–0.973) 0.946 (0.924–0.962) 0.893 (0.851–0.924)
Responsiveness pre-treatment vs 6 months after arthroscopic treatment, mean (SD) c
Pre-treatment score 40.5 (14.5) 33.4 (13.0) 31.2 (14.5) 38.4 (16.1) 42.9 (26.5) 37.3 (16.2)
Post-treatment score 73.5 (19.4) 62.3 (17.2) 53.9 (21.4) 69.5 (19.0) 85.1 (17.1) 68.5 (19.0)
Score change 33.0 (16.6) 28.9 (15.1) 22.8 (17.9) 31.2 (18.6) 42.2 (27.6) 31.2 (13.7)
ES 2.27 2.22 1.57 1.94 1.59 1.92
SRM 1.99 1.91 1.27 1.68 1.52 2.28
  1. C-WORC Chinese version of the Western Ontario Rotator Cuff Index, OSS Shoulder Oxford score, SD Standard deviation, ICC Intraclass correlation coefficient, CI Confidence interval, ES Effect size, SRM Standardized response mean
  2. aCalculated by the Pearson correlation coefficient (r) or Spearman’s correlation coefficient (rs) of the C-WORC with OSS and SF-36
  3. bThe sample size for the analysis of construct validity and test-retest reliability was 124
  4. cThe sample size for the analysis of responsiveness was 108