Psychometric properties of the Knowledge and Understanding Questionnaire of the Canadian Assessment of Physical Literacy-2 in low-income Brazilian children

This study aimed to translate and cross-culturally adapt the Physical Literacy Knowledge (PLK) questionnaire from Canadian Assessment of Physical Literacy-2for Portuguese version, and to evaluate its psychometric properties (construct validation, content, composite reliability, measurement invariance) in low-income Brazilian children.The sample comprised of 562 children (247 girls), aged between 8.00 and 12.99 years-old (10.20 +/- 1.20 years), enrolled in the 12 public-school in Lagoa do Carro city, Pernambuco, Brazil. A translation and cross-cultural adaptation of the PLK questionnaire was carried out. Content validity was determined by cal-culating the content validity coefficient, which assesses the relevance, clarity and pertinence of total (CVCt) and each question individ-ually (CVCi). The dimensional structure of the PLK and alternative models were considered with first and second order models.Internal consistency was assessed using composite reliability. Structural invariance (configural, metric, scalar and strict) between sexes was also assessed using a multigroup factor analysis. Content validity was considered acceptable, varying between 0.88 and 1.00 forCVCi, and 0.91, 0.94 and 0.99 for clarity, pertinence and relevance in the CVCt, respectively. Construct validity was considered adequate, with 3 dimensions and 9 items model being the most appropriate [chi(2)(df)=34.01(24); CFI=0.92; TLI=0.87; RMSEA=0.03; SRMR=0.04; 90%CIRMSEA=0.00-0.05]. The questionnaire was structurally invariant (all Delta CFI<0.05). Based on the findings, the PLK questionnaire has adequate psychometric properties to assess the cognitive domain of Physical Literacy in low-income Brazilian children.