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Psychol Med. 2017 Aug;47(11):1923-1935. doi: 10.1017/S0033291717000319. Epub 2017 Mar 2.

Baseline demographics, clinical features and predictors of conversion among 200 individuals in a longitudinal prospective psychosis-risk cohort.

Author information

1
The Center of Prevention and Evaluation,New York State Psychiatric Institute,Columbia University Medical Center,New York, NY,USA.
2
City University of New York,New York, NY,USA.
3
Department of Psychology,The Catholic University of America,Washington, DC,USA.
4
F. Hoffman-LaRoche A.G.,Basel,Switzerland.
5
Department of Social and Behavioral Sciences,College of Global Public Health, New York University,New York, NY,USA.

Abstract

BACKGROUND:

DSM-5 proposes an Attenuated Psychosis Syndrome (APS) for further investigation, based upon the Attenuated Positive Symptom Syndrome (APSS) in the Structured Interview for Psychosis-Risk Syndromes (SIPS). SIPS Unusual Thought Content, Disorganized Communication and Total Disorganization scores predicted progression to psychosis in a 2015 NAPLS-2 Consortium report. We sought to independently replicate this in a large single-site high-risk cohort, and identify baseline demographic and clinical predictors beyond current APS/APSS criteria.

METHOD:

We prospectively studied 200 participants meeting criteria for both the SIPS APSS and DSM-5 APS. SIPS scores, demographics, family history of psychosis, DSM Axis-I diagnoses, schizotypy, and social and role functioning were assessed at baseline, with follow-up every 3 months for 2 years.

RESULTS:

The conversion rate was 30% (n = 60), or 37.7% excluding participants who were followed under 2 years. This rate was stable across time. Conversion time averaged 7.97 months for 60% who developed schizophrenia and 15.68 for other psychoses. Mean conversion age was 20.3 for males and 23.5 for females. Attenuated odd ideas and thought disorder appear to be the positive symptoms which best predict psychosis in a logistic regression. Total negative symptom score, Asian/Pacific Islander and Black/African-American race were also predictive. As no Axis-I diagnosis or schizotypy predicted conversion, the APS is supported as a distinct syndrome. In addition, cannabis use disorder did not increase risk of conversion to psychosis.

CONCLUSIONS:

NAPLS SIPS findings were replicated while controlling for clinical and demographic factors, strongly supporting the validity of the SIPS APSS and DSM-5 APS diagnosis.

KEYWORDS:

Attenuated psychosis; clinical high-risk for psychosis; first episode of psychosis; prodromal psychosis; schizotypy

PMID:
28249639
PMCID:
PMC5893280
DOI:
10.1017/S0033291717000319
[Indexed for MEDLINE]
Free PMC Article

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