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Table 4 Construct validity of the Dutch OKS-APQ

From: Translation, cross-cultural adaptation, reliability and construct validity of the Dutch Oxford Knee Score – Activity and Participation Questionnaire

Predefined Hypothesis

Spearman correlation* (r)

Pooled sample

Preoperative sample

Postoperative sample

1. A strong positive correlation between OKS-APQ and OKS;

0.83

0.63

0.80

2. A strong positive correlation between OKS-APQ and FJS;

NA

NA

0.74

3. A strong positive correlation between OKS-APQ and PCS (SF-36);

0.65

0.40

0.59

4. A moderate to strong negative correlation between OKS-APQ and VAS pain;

0.68

–0.43

–0.63

5. A weak to moderate positive correlation between OKS-APQ and MCS (SF-36);

0.47

0.50

0.40

  1. Abbreviations: OKS-APQ Oxford knee score – Activity & Participation Questionnaire, OKS Oxford knee score, FJS Forgotten joint score, SF-36 36-Item Short Form Health Survey Questionnaire, VAS for pain Visual Analogue Scale, PCS Physical Component Score, MCS Mental Component Score
  2. *All correlations P < 0.001