Table 3

Fit indices of one-factor and two-factor models of OKS

Factorsχ2 (p Value)DfRMSEA90% CI RMSEARMSEA p testCFISRMRPNFI
171.32 (0.06)540.0520.00 to 0.080.440.990.0430.80
256.64 (0.34)530.0240.00 to 0.060.8310.0390.79
  • p Value for test of close fit (RMSEA <0.05).

  • CFI, comparative fit index; df, degrees of freedom; OKS, Oxford Knee Score; PNFI, Parsimonious Normed Fit Index; RMSEA, root mean square error of approximation; SRMR, standardised root mean square residual.