Psychometric properties of the Brazilian version of the Coach–Athlete Relationship Questionnaire for coaches

The aim of this study was to assess the psychometric properties of the Brazilian version of the Coach–Athlete Relationship Questionnaire (CART-Q) for coaches. Subjects were 173 coaches (20–65 years old) from both sexes, from individual and team sports, ranging from amateur to national level; the instruments were the Coach version of CART-Q translated and adapted to Portuguese and the Athletic Satisfaction Scale adapted for coaches. Data analysis consisted of confirmatory factor analysis, internal consistency (Cronbach's alpha and composite reliability), concurrent validity (Spearman correlation), and temporal stability (intraclass correlation coefficient, ICC). Confirmatory factor analysis revealed a model with 11 items presenting adequate fit (χ2/df = 2.68; comparative fit index = 0.92; goodness-of-fit index = 0.91; Tucker–Lewis index = 0.90; root mean square error of approximation = 0.10) and the existence of a second-order factor (coach–athlete relationship). The scale has shown satisfactory internal c...