Factor analyses of the SDS, CAST and CUDIT have been reported in four studies using adolescent and adult general population samples [13,15,23,24]. In all cases analyses resulted in a single factor solution that accounted for a substantial portion of the total variance (53% and 57.6%). Individual factor loadings were moderate to high (.41 to .87) for most items (except for CUDIT item 9 performing very weakly).
