Psychometric properties of a Farsi version of the Basic Needs Satisfaction in General Scale in a sample of Iranian population

The main purpose of this study was to examine psychometric properties of a Farsi version of the Basic Needs Satisfaction in General Scale (BNSG-S) including internal consistency, test-retest reliability, content validity, and convergent and discriminant validity. Three hundred and twelve Iranian volunteers (120 males, 192 females) were included in this study. All participants were asked to complete the BNSG-S (Gagne, 2003), the Eysenck Personality Questionnaire-Revised Short Scale (EPQ-RS; Eysenck, Eysenck, & Barrett, 1985), Positive and Negative Affect Schedule (Watson, Clarke, & Tellegen, 1988), and the Mental Health Inventory (MHI-28; Besharat, 2009). Test-retest reliability and internal consistency of the BNSG-S were examined at satisfactory levels. Content validity of the BNSG-S was calculated according to Kendall's coefficients of concordance for BNSG-S subscales including Autonomy, Competence, and Relatedness. All Kendall's coefficients of concordance were statistically significant. The BNSG-S subscales revealed significant positive associations with extraversion, positive affect, and psychological well-being, as well as significant negative associations with neuroticism, negative affect, and psychological distress. These results confirmed the convergent and discriminant validity of the BNSG-S.