SU Na,WANG Lu,SHI Jing-yu,et al.Reliability and validity of Prodromal Questionnaire(PQ-16) in assessing psychosis-risk of college students[J].Journal of Tongji University(Medical Science),2015,36(3):123-127. [点击复制]
Objective To test the reliability and validity of the 16-Item version of the Prodromal Questionnaire(PQ-16) in evaluating psychosis-risk of college students. Methods A survey by using PQ-16 was conducted in 2496 college students, and those with distress score >6 were further interviewed with Structured Interview for Prodromal Syndromes(SIPS). Results The Cronbach`s alpha for item score model and distress score model of PQ-16 was 0.751 and 0.784, respectively. The Guttman split-half coefficient was 0.721 by the item score and 0.761 by the distress score. By exploratory factor analysis, there were 4 factors with initial eigenvalue >1. The cumulative variation was 41.7%, and the matrix values of all factors were 0.404-0.639. The Pearson coefficient between item scores and total scores was 0.355-0.548, while between distress scores and total scores was 0.385-0.597(P＜0.01). Among participants whose distress scores>6,1 subjects had positive SIPS results and 599 had negative results, there was significant difference in distress scores between these two groups(P＜0.05).The area under the ROC curve of distress score was greater than that of item score, and a cut-off distress score of 10 yielded 68% sensitivity and 73% specificity for psychosis-risk assessment. Conclusion The PQ-16 in Chinese version shows good reliability and validity when evaluating psychosis-risk in college students and the distress score model is better for screening.
