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Low IQ has been associated with schizophrenia, even to the point of being posited as a possible causal factor for psychosis. However, individuals with normal and high IQ also develop psychotic illnesses. The aim of this study was to characterize premorbid IQ subgroups at first episode of psychosis (FEP).
The study sample comes from a large epidemiological, 3-year longitudinal, intervention program on psychosis containing individuals living in a catchment area in Spain. Estimated premorbid IQ (epIQ) scores were used to build low (< 90), normal (90?110) and high (> 110) epIQ subgroups in samples of FEP patients (N = 292) and healthy controls (N = 199). The epIQ subgroups were compared in sociodemographic, neuropsychological, clinical and premorbid characteristics. Long-term functional and cognitive outcome, with a focus on sex differences, were also explored.
Low-epIQ was more frequently found in FEP patients (28.8%) than in healthy controls (14.6%). Low-epIQ patients were more likely to have worse premorbid adjustment, belong to low socioeconomic status families, have less years of education, and to be single, unemployed, and younger. They presented more severe impairments in processing speed, executive and global cognitive function. Female patients with low-epIQ showed better baseline function and more stable outcome than males.
Our results indicate that low premorbid IQ is a morbid manifestation, easily detected in a subgroup of FEP patients that predicts poorer outcome particularly in males. This perspective provides important information for the tailoring of subgroup-specific early intervention programs for psychosis.
Fuente: Schizophrenia Research
Volume 197, July 2018, Pages 370-377
Fecha de publicación: 01/07/2018
Nº de páginas: 8
Tipo de publicación: Artículo de Revista
Url de la publicación: https://doi.org/10.1016/j.schres.2017.12.006
MARIA ROSA AYESA ARRIOLA
MARIA ESTHER SETIEN SUERO
NEERGAARD, KARL DAVID
ALBACETE BELZUNCES, ÀURIA
HAREN, NEELTJE E.M. VAN
BENEDICTO CRESPO FACORRO