Reliability, validity and internal consistency of social support and self-efficacy scales for physical activity in adolescents with 10 to 14 years of age.

Objective: To analyze the reliability, validity and internal consistency of the physical activity social support (SSS) and self-efficacy (SES) scales among adolescents aged 10-14 years. Methods: The reliability study included 171 adolescents (mean age=12.3±1.0 years, 59.6% female) and validity and consistency study with 1,107 (mean age=12.0±1.0 years, 52.7% female). The SSS had 15 items and the SES eight items. Reliability was determined by Spearman's correlation analysis (rho) and validity and internal consistency by factor analysis (exploratory -- EFA and confirmatory -- CFA) and the composite reliability (CR), respectively. Results: The reliability of SSS (father: rho=0.80; p<0.001 | mother: rho=0.76; p<0.001 | friends: rho=0.75; p<0.001) and SES (rho=0.72; p<0.001) were considered high. In the EFA, three factors were identified for the SSS (father, mother and friends -- five items each) and one factor for SES (five items), confirmed in the CFA. Quality parameters of adjustment in the final models were satisfactory for SSS (chi-square=240.5 [p<0.001]; root mean square residual -- RMR=0.05; root mean square error of approximation -- RMSEA=0.04 [90%CI 0.04-0.05]; goodness of fit index -- GFI=0.97; adjusted goodness of fit index -- AGFI=0.96 and comparative fit index -- CFI=0.97) and SES (chi-square=5.4 [p=0.07]; RMR=0.01; RMSEA=0.04 [90%CI 0.00-0.08]; GFI=0.99; AGFI=0.99 and CFI=0.97). Internal consistency was considered satisfactory for SSS (CR: father=0.79, mother=0.77, friends=0.78) and low for SES (CR=0.38). Conclusions: The scales showed satisfactory levels of reliability and of construct validity. However, only the SSS showed adequate levels of internal consistency. [ABSTRACT FROM AUTHOR]

Objetivo: Analisar a reprodutibilidade, a validade e a consistência interna da escala de apoio social (EAS) e da escala de autoeficácia (EAE) para a atividade física em adolescentes de 10 a 14 anos de idade. Métodos: O estudo de reprodutibilidade contou com 171 adolescentes (12,3±1,0 ano; 59,6% feminino), e o de validade e consistência, com 1.107 (12,0±1,0 ano; 52,7% feminino). A EAS continha 15 itens, e a EAE, oito. A reprodutibilidade foi estimada pela correlação de Spearman (rho), e a validade e a consistência interna, pela análise fatorial (exploratória -- AFE e confirmatória -- AFC) e pelo índice de fidedignidade combinada (IFC), respectivamente. Resultados: A reprodutibilidade da EAS (pai: rho=0,80; p<0,001, mãe: rho=0,76; p<0,001 e amigos: rho=0,75; p<0,001) e da EAE (rho=0,72; p<0,001) apresentou forte magnitude. Na AFE, foram identificados três fatores para EAS (pai, mãe e amigos -- cinco itens cada) e um fator para EAE (cinco itens), confirmados na AFC (com quatro itens na EAE). Os modelos finais apresentaram indicadores de qualidade satisfatórios para EAS -- qui-quadrado=240,5 (p<0,001); root mean square residual (RMR)=0,05; root mean square error of approximation (RMSEA)=0,04 (intervalo de confiança de 90% -- IC90% 0,04-0,05); goodness of fit index (GFI)=0,97; adjusted goodness of fit index (AGFI)=0,96 e comparative fit index (CFI)=0,97 -- e EAE -- qui-quadrado=5,4 (p=0,07); RMR=0,01; RMSEA=0,04 (IC90% 0,00-0,08); GFI=0,99; AGFI=0,99 e CFI=0,97. A consistência interna foi satisfatória para EAS (índice de fidedignidade combinada -- IFC: pai=0,79; mãe=0,77; amigos=0,78) e baixa para EAE (IFC=0,38). Conclusões: As escalas alcançaram níveis satisfatórios de reprodutibilidade e validade de construto. No entanto, apenas a EAS apresentou níveis de consistência interna adequados. [ABSTRACT FROM AUTHOR]

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