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[Prefrontal symptoms in daily life: normalization and standardization of the Prefrontal Symptoms Inventory in the Spanish population].

INTRODUCTION
The short Prefrontal Symptoms Inventory (PSI-20) is a questionnaire that investigates symptoms of prefrontal malfunctioning in daily life. It has been shown to have good psychometric properties and has been applied in the general population and clinical samples from Spain and other Spanish-speaking countries.


AIMS
To normalise and standardise the PSI-20 in a broad sample of subjects of all ages in a Spanish population.


SUBJECTS AND METHODS
The PSI-20 was administered to 4704 subjects: in one sample made up of 2474 subjects from the Spanish general population, over 18 years of age, and in another consisting of 2230 school-age subjects (15-17 years old), representative of the population of Madrid.


RESULTS
The effect of the interaction of sex, age and level of education on the scores was observed, although the effect of level of education was low. As expected, the adolescents, still undergoing their process of maturation, obtained higher scores on all the subscales and the questionnaire as a whole. Females scored significantly higher on symptoms of poor emotional control, and males achieved higher scores on symptoms of poor control over social behaviour. Tables were developed differentiated by sex and for those above and below 18 years of age.


CONCLUSION
The data presented allow us to interpret the scores obtained in the PSI-20 in the Spanish population, including subjects under 18 and adults.