Table 4.
Construct validity of the Dutch OKS-APQ
| 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 |
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
*All correlations P < 0.001