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Tijdschrift voor Psychiatrie 58 (2016) 10, 695 - 699

Short report

Prognostic modelling and proactive intervention in psychosis: efficacy and cost-effectiveness

M. van der Gaag, H. Ising, J. Lokkerbol, F. Smit

background Diagnoses have heterogeneous outcomes, varying from good to extremely poor. There is a need to single out an ultra-high-risk group of individuals who have illnesses that might well end unfavourably or who might later develop serious psychopathology.
aim To devise a screening instrument that can identify a group of individuals who run a very high risk of developing a first-episode psychosis, and to create a type of intervention that can modify the course of the illness.
method We developed a short screening instrument (pq-16) and were able to ascertain its predictive value. We also tested an intervention that could influence risk factors and deal with emerging symptoms thereby achieving a better outcome for the patient.
results We developed a two-step detection instrument with a positive predictive value of 44%. The intervention, involving cognitive behavioural therapy for ultra-high-risk patients, was effective and led to a risk reduction of about 50%. Using the ultra-high-risk group of patients, we were able to model three prognostic profiles, each carrying a 4%, 13%, and 70% risk of subsequently developing psychosis. The intervention was cost-effective, reducing the financial burden on the health care services and on society as a whole.
conclusion Prognostic modelling and proactive intervention can achieve improvements in health at lower costs.

keywords intervention, psychosis, risk stratification, screening instrument