Table 4.
Summary of Psychometric Analyses for the LE CAT, HOS, and mHHS
| HOS | ||||
|---|---|---|---|---|
| LE CAT | ADL | Sports | mHHS | |
| Validities | ||||
| Item fit: outfit MNSQ | 0.79 | 1.02 | 0.91 | 0.92 |
| Dimensionality–first dimension: unexplained variance of residual, % | 1.5 | 5.4 | 7.4b | 5.2 |
| Monotonicity: disordered thresholds, n | 0 | 0 | 0 | 0 |
| Local independence: residual correlation >0.8, n | 0 | 0 | 0 | 0 |
| Differential item functioning | ||||
| Sex, n | 0 | 3 | 0 | 2 |
| Age, n | 2 | 2 | 4b | 2 |
| Person raw score to measure: correlation | 0.94 | 0.86 | 0.83 | 0.84 |
| Instrument coverage | ||||
| Ceiling effect, % | 8.47 | 36.02b | 0 | 27.54b |
| Floor effect, % | 0 | 0 | 0 | 0 |
| Reliabilities | ||||
| PSI | 2.75 | 1.28 | 1.34 | 0.08b |
| Cronbach α | 1 | 0.97 | 0.97 | 0.41b |
aADL, activities of daily living subscale; HOS, Hip Outcome Score; LE CAT, Lower Extremity Computerized Adaptive Test; mHHS, modified Harris Hip Score; MNSQ; mean square; PSI, person separation index; Sports, sports subscale.
bArea of concern.