Fit indices of one-factor and two-factor models of ICOAP and KOOS-PS
| χ2 (p Value) | Df | RMSEA | 90% CI RMSEA | RMSEA p test | CFI | SRMR | PNFI | |
|---|---|---|---|---|---|---|---|---|
| ICOAP (1F) | 242.31 (0.00) | 44 | 0.19 | 0.17 to 0.22 | 0.00 | 0.95 | 0.064 | 0.75 |
| ICOAP (2F) | 228.19 (0.00) | 43 | 0.19 | 0.16 to 0.21 | 0.00 | 0.96 | 0.057 | 0.74 |
| KOOS-PS (1F) | 40.88 (0.00) | 14 | 0.13 | 0.09 to 0.18 | 0.00 | 0.98 | 0.046 |
p Value for test of close fit (RMSEA <0.05).
CFI, comparative fit index; df, degrees of freedom; F, number of factors; ICOAP, Intermittent and Constant Osteoarthritis Pain; KOOS-PS, Knee Injury and Osteoarthritis Score-Physical Function Short Form; PNFI, Parsimonious Normed Fit Index; RMSEA, root mean square error of approximation; SRMR, standardised root mean square residual.