Table 3 Coefficients of the predictive equations of utilities (EQ-5D) based on the Oxford Knee Score (OKS) items. Estimation sample

 OKS1: Usual level of pain

0.0471^§ (0.0122)

0.0434^§ (0.0129)

−0.155^§ (0.0384)

0.2227^Ŧ (0.0699)

 OKS2: Difficulty with washing and drying

0.0532^§ (0.0122)

0.0525^§ (0.0121)

−0.106^§ (0.0271)

0.2296^§ (0.0521)

 OKS3: Difficulty with cars/public transport

0.1592* (0.0666)

 OKS4: Walking duration before pain

0.0794* (0.0353)

 OKS9: Pain that interferes with work

0.0574^§ (0.0119)

0.0515^§ (0.0121)

−0.120^§ (0.0317)

0.2688^§ (0.0477)

 OKS10: Knee instability sensation

0.0289^Ŧ (0.0102)

0.0263^Ŧ (0.0100)

−0.0491* (0.0207)

0.1431^§ (0.0340)

 OKS11: Grocery shopping alone

0.0432^§ (0.0104)

0.0385^§ (0.0104)

−0.0710^Ŧ (0.0235)

 OKS12: Difficulty walking down stairs

0.0276* (0.0118)

−0.0881^Ŧ (0.0280)

 Constant

0.122^§ (0.0270)

0.1034^§ (0.0273)

0.124* (0.0536)

−1.4199^§ (0.2001)

 Observations

390

390

390

386

 Adjusted R²

0.595

0.606

 Sigma

0.171 (0.007)

 AIC

− 257.1

−211.3

−289.1

− 457.2

 BIC

−233.3

−243.1

−261.3

− 425.6