Psychometric Properties and Validity of a Brief Scale Measuring Basic Psychological Needs Satisfaction in Adolescents

Studies have shown that the satisfaction of basic psychological needs, as defined by Self-Determination Theory, has a great impact on adolescents' well-being, prosocial behavior and academic success. In the present study, we aim to validate a brief scale for adolescents measuring the satisfaction of the three basic needs for autonomy, competence, and relatedness. A preliminary qualitative study was conducted to select and adapt for adolescents a subset of 12 items from the original version of the Basic Psychological Needs Satisfaction Scale (BPNS). This version of the scale was then analyzed in terms of dimensionality, measurement invariance and criterion validity on a sample of 308 Italian adolescents (M age = 14.04 years; 57.1% males). The results of confirmatory factor analyses supported the posited three-factors structure and the measurement invariance of the instrument across gender. Correlations with a measure of psychological well-being provided evidence for criterion validity. The scale proved to be a valid and reliable instrument to measure the levels of satisfaction of the psychological need for autonomy, competence and relatedness in adolescents