PMID- 26792832 OWN - NLM STAT- MEDLINE DCOM- 20170110 LR - 20231220 IS - 1468-960X (Electronic) IS - 1362-0347 (Print) IS - 1362-0347 (Linking) VI - 19 IP - 1 DP - 2016 Feb TI - Predicting the onset of psychosis in patients at clinical high risk: practical guide to probabilistic prognostic reasoning. PG - 10-5 LID - 10.1136/eb-2015-102295 [doi] AB - Prediction of psychosis in patients at clinical high risk (CHR) has become a mainstream focus of clinical and research interest worldwide. When using CHR instruments for clinical purposes, the predicted outcome is but only a probability; and, consequently, any therapeutic action following the assessment is based on probabilistic prognostic reasoning. Yet, probabilistic reasoning makes considerable demands on the clinicians. We provide here a scholarly practical guide summarising the key concepts to support clinicians with probabilistic prognostic reasoning in the CHR state. We review risk or cumulative incidence of psychosis in, person-time rate of psychosis, Kaplan-Meier estimates of psychosis risk, measures of prognostic accuracy, sensitivity and specificity in receiver operator characteristic curves, positive and negative predictive values, Bayes' theorem, likelihood ratios, potentials and limits of real-life applications of prognostic probabilistic reasoning in the CHR state. Understanding basic measures used for prognostic probabilistic reasoning is a prerequisite for successfully implementing the early detection and prevention of psychosis in clinical practice. Future refinement of these measures for CHR patients may actually influence risk management, especially as regards initiating or withholding treatment. CI - Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/ FAU - Fusar-Poli, P AU - Fusar-Poli P AD - King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK OASIS service, South London and the Maudsley NHS Foundation Trust, London, UK. FAU - Schultze-Lutter, F AU - Schultze-Lutter F AD - University Hospital of Child and Adolescent Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland. LA - eng PT - Journal Article PT - Review PL - England TA - Evid Based Ment Health JT - Evidence-based mental health JID - 100883413 SB - IM MH - Humans MH - Kaplan-Meier Estimate MH - Probability MH - Prognosis MH - Psychotic Disorders/*diagnosis MH - Risk Assessment MH - Risk Factors PMC - PMC10699348 EDAT- 2016/01/23 06:00 MHDA- 2017/01/11 06:00 PMCR- 2016/02/01 CRDT- 2016/01/22 06:00 PHST- 2016/01/22 06:00 [entrez] PHST- 2016/01/23 06:00 [pubmed] PHST- 2017/01/11 06:00 [medline] PHST- 2016/02/01 00:00 [pmc-release] AID - eb-2015-102295 [pii] AID - ebmental-2015-102295 [pii] AID - 10.1136/eb-2015-102295 [doi] PST - ppublish SO - Evid Based Ment Health. 2016 Feb;19(1):10-5. doi: 10.1136/eb-2015-102295.