The aim of the present study was to provide psychometric evidence regarding the factorial construct validity of the two versions of the Coach-Athlete Relationship Questionnaire (CART-Q self-perceptions) [1] CART-Q meta-perceptions [2]). These measurement scales were developed to measure the quality of the coach-athlete relationship through the constructs of Closeness, Commitment and complementarity (3Cs). Methods A total of 591 British athletes (414 male, 177 female) performing in team sports (hockey, football, rugby, basketball, volleyball) participated in the study. Age of the participants ranged from 16 to 38 years. Different levels of participation were included: premiership (90), national (102), county (125), regional (240) and recreational (34). Also participants had a varied length of relationship with coaches ranging from as little as a week to more than 3 years. Both versions of the CART-Q were administered before a training session. Confirmatory Factor Analysis using EQS, was employed to examine the validity of the instrumentations' factorial structure. A hierarchical second-order factor model in which the three constructs of closeness, commitment and complementarity were subsumed was tested. The same fit indexes were employed as in Jowett and Ntoumanis' (2004) study for comparison reasons. Results Table 1 presents the fit indexes of the hierarchical model tested. The S-B?2 for both models were statistically significant whereas the CFI (Robust) and NNFI were approached and reached 0.95 [3]. Factor loadings of the three first-order factors in both models were high and ranging from 0.93 to 0.99 and were statistically significant. Results also illustrated that all items loaded as expected on their designated constructs providing evidence for convergent validity. The items of both questionnaires recorded squared multiple correlation (R2) values beyond 0.50 except for two items (both of which loaded on the Commitment scale). Discussion / Conclusions The main purpose of the study was to provide further evidence of the factorial structure of the self- and meta-perception versions of the CART-Q utilising a sample of team sport performers. The information presented shows that the CART-Q (both versions) has adequate psychometric properties. The low R2 values recorded for the two items of Commitment may have resulted due to the composition of this particular sample which consisted of over 50% of sport performers with less than 6 month relationship with coach.
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