Data extraction for this review followed predefined criteria considered important in the evaluation of screening instruments and was guided by a standardised documentation sheet. As indicators of reliability, internal consistency and test-retest reliability were considered. Construct validity was evaluated by considering the scales' factor structure as well as correlations with related constructs (convergent validity). Concerning criterion validity, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were included. Moreover, results of Receiver Operating Characteristics (ROC) computing cut-off values are reported.
