Fig. 2

Receiver Operating Characteristic (ROC) Curves for Screening Instruments Utilized in Household Informant Interview Method for Different Outcomes. The ROC curve is a graphical plot illustrating the performace in terms of sensitivity and 1-specificity of the instrument at different cut off values, compared to the psycholgist’s assessment. a (top) shows the ROC for different cut-offs of the vignette (VOLTAC), the household informant component of WASSS (WASSS-H) and the combination of the instruments against the outcome of psychosis or of a current mental disorder accompanied by severe psychological impairment. b (middle) shows the ROC for the same instruments when predicting either psychosis or a current mental disorder accompanied by moderate or severe psychological impariment. c (bottom) shows the ROC for the same instruments when predicting only current psychosis