Detailed contribution information
| Contribution title | 3062 - The concordance of child self-reported psychotic experiences with interview-and observer-based psychotic experiences. |
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| Contribution code | PS03-74 (P) |
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| Form of presentation | Poster |
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| Abstract |
Objectives: A new section of The Development and Well-Being Assessment (DAWBA) questionnaire measuring Psychotic Experiences (PE) has yet to be validated. The current study aims to investigate the concurrent validity of DAWBA-based self-reported PE (PE-S) with regard to the “gold standard” interview-based measures of PE (PE-I). Methods: Participants were 1571 children of age 11-12 years from the Copenhagen Child Cohort 2000 (CCC2000). All participants completed the web-based DAWBA including the section on PE-S. This section asks the child about 10 different “strange experiences that are surprisingly common”, covering auditory and visual hallucinations, delusional ideas and subjective thought disturbances ever in life. In the present study scores of “sometimes” and “often” were collapsed into a positive rating of any PE. For a secondary analysis, only PE with no frequent attribution to sleep, substance use, fever or neurological disorder was counted as positive. After completion of the DAWBA, the children were assessed by a semi-structured interview with clinical probing and cross-examination of PE, based on 22 K-SADS-PL-items covering 9 types of hallucinations and 13 types of delusions. Symptoms were scored as ‘not present’ vs. ‘likely/definitely present’ during the last month and lifetime before, respectively, and collapsed into a positive rating of PE-I ever in life. The interviewers were trained professionals, blinded for the DAWBA results. PE-I was rated not present if occurring only in relation to sleep, substance use, fever or somatic illness. Results: The prevalence of PE-S was 28.1% (24.3% for PE-S with no attributions), compared with 10.2% for PE-I. The predictive values for any PE-S were: sensitivity=0.74, specificity=0.77, positive predictive value (PPV) =0.27 and negative predictive value (NPV) =0.96. The predictive values for any PE-S with no attribution were: sensitivity=0.56, specificity=0.79, PPV=0.23 and NPV=0.94. Conclusion: PE are common in preadolescence, particularly when self-reported. The sensitivity and the specificity of any PE-S with regard to PE-I was substantial, and the NPV was excellent, whereas the PPV was low. Restricting PE-cases to those with no frequent attribution decreased the sensitivity without improvement of the PPV and can therefore not be recommended. The results support the use of the DAWBA as a valuable screening tool for PE in the general population of children and adolescents. |