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Receiver operating characteristic (ROC) curves of predictive values for online questionnaires scores toward CHR status. Blue line: ROC curve for PQ-16 scores in relationship to UHR status as assessed by the CAARMS. Red line: ROC curve for PCA scores in relationship to SPI-A CHR status. Green line: ROC curve for combined PQ-16/PCA scores and CHR status. Black dashed line: reference line of performance no better than chance.
