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Psychiatry Investig. 2018 Feb;15(2):111-117. doi: 10.30773/pi.2017.04.24. Epub 2017 Nov 29.

Validation of the Korean version of the 16-Item Prodromal Questionnaire in a Non-Help-Seeking College Population.

Author information

1
Mindlink, Gwangju Bukgu Community Mental Health Center, Gwangju, Republic of Korea.
2
Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea.
3
Gwangju Mental Health Commission, Gwangju, Republic of Korea.
4
Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea.
5
Department of Psychology, Chonnam National University, Gwangju, Republic of Korea.

Abstract

OBJECTIVE:

To examine the reliability and validity of the Korean version of the 16-item Prodromal Questionnaire (KPQ-16) in non-help-seeking university students.

METHODS:

Among 2,246 university students participated in the initial screening, 257 subjects with KPQ-16 scores ≥4 were interviewed. The criteria for ultra-high risk (UHR) of psychosis of the Comprehensive Assessment of At-Risk Mental States (CAARMS) were the gold standard for diagnosis. An exploratory modified version of the questionnaire (mKPQ-16), to which three items from the Eppendorf Schizophrenia Inventory were added, was also used to compensate for items on thought and cognitive problems.

RESULTS:

Seventeen subjects met the CAARMS criteria for UHR of psychosis. The area under the receiver operating characteristic curve (AUROC) was highest for the mKPQ-16 total score (AUROC=0.831, p<0.001). The use of cutoff total scores of 7 for the mKPQ-16 and 6 for the KPQ-16 resulted in the best balance of sensitivity (76.5% and 64.7%, respectively) and specificity (75.4% and 71.2%, respectively).

CONCLUSION:

The Korean versions of the PQ-16 are good instruments for screening for psychosis risk in university students. This validation of a questionnaire version with a small number of items may make it feasible to screen large numbers of young adults in the community.

KEYWORDS:

Attenuated psychosis syndrome; PQ-16; Schizophrenia; Screening; Ultra-high risk

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