Item selection based on CTT and IRTWhen CAID was used, we calculated the initial Cronbach’s α coefficient when all 64 items were retained; thisdid not result in deletion of any items, the detailed resultwas not shown here.In IRT a number of items were suggested for deletion:fourteen in PHD, four in PSD, and seven in TRD; andonly one item was retained in SOD according to parameters a and b. Fig. 2 shows the ICC matrix