This study of 260 Portuguese early adolescents (Grades 5 to 7; 11–14 years old) used a questionnaire which taps six different domains and was devised by Hatter to evaluate the self-concepts of children and early adolescents in Grades 3 to 7. The Portuguese version has Cronbach coefficients alpha between .25 and .80. The results of factor analysis and correlational studies evidence a low differentiation of the dimensions of self-concept. Results of differential studies by sex and school grade indicate girls see themselves as better behaved than do boys and boys see themselves as significantly more athletically competent than do girls. Also, fifth graders see themselves as more competent in five domains of self-concept than do seventh graders.
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