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Table 4 Patient-reported outcome measures according to the preoperative threshold value on the OKS

From: The Oxford Knee Score is a reliable predictor of patients in a health state worse than death and awaiting total knee arthroplasty

Functional Measure

OKS (mean, SD)

Difference (95% CI)

P -value*

 

 > 16 (n = 2119)

 ≤ 16 (n = 957)

  

Preoperative OKS

24.8 (5.7)

11.7 (3.4)

13.1 (12.7 to 13.5)

 < 0.001

Postoperative OKS

38.4 (8.0)

32.2 (10.5)

6.2 (5.5 to 6.9)

 < 0.001

Difference

13.6 (8.4)

20.5 (10.5)

6.9 (6.2 to 7.6)

 < 0.001

P -value**

 < 0.001

 < 0.001

  

Preoperative EQ-5D

0.575 (0.231)

0.169 (0.268)

0.406 (0.387 to 0.424)

 < 0.001

Postoperative EQ-5D

0.818 (0.204)

0.667 (0.286)

0.150 (0.133 to 0.168)

 < 0.001

Difference

0.242 (0.277)

0.499 (0.340)

0.257 (0.234 to 0.280)

 < 0.001

P -value**

 < 0.001

 < 0.001

  

Satisfaction

87.8 (16.9)

83.7 (19.5)

4.2 (2.8 to 5.6)

 < 0.001

  1. CI Confidence intervals, EQ-5D EuroQol 5-dimension, OKS Oxford Knee Score, SD standard deviation
  2. * unpaired t-test
  3. ** paired t-test