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Table 2 Internal consistency and factor analysis for dichotomous variables (latent trait model)

From: The effect of depressive symptoms on the association between radiographic osteoarthritis and knee pain: a cross-sectional study

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 Cronbachs Alpha 0.66