Table 2 Internal consistency and factor analysis for dichotomous variables (latent trait model)
Question | Factor loading | Cronbach’s alpha if item deleted |
|---|---|---|
“In the last year did you have more than 3 knee pain episodes?” | 0.91 | 0.51 |
“During the last 6 months did knee pain last longer than a week?” | 0.86 | 0.70 |
“During the last month did you have knee pain?” | 0.98 | 0.46 |
Global Cronbach’s Alpha | 0.66 | |