Introduction: Social and cultural changes are altering young people's habits. Some surveys measure such behaviors, but are hard to interpret. The objective of this study was to design and validate a homogeneous questionnaire to study habits among adolescents aged 12-14 years.
Population And Methods: Descriptive and crosssectional study to validate a questionnaire. Items were selected after a bibliographic review and expert assessment. The pre-test was administered to a pilot sample. Reliability was established using Cronbach's alpha coefficient, and construct validity, using a factor analysis. It was administered to a sample of parents of students from 4 secondary schools.
Results: Cronbach's coefficient showed values close to 0.7 in 3/4 subscales and an overall value of 0.629, showing accuracy and stability. Factor analysis determined an adequate construct validity, with 4 factors: eating, physical activity, new technologies, and environment. The final questionnaire included 26 items and was administered to 421 participants. Poor habits were observed in 24.8 % and very unhealthy, in 3.4 %. Girls had poorer scores in physical activity (p < 0.001), and boys, in new technologies, although it was not significant.
Conclusions: The final instrument was valid, reliable, and easily administered to assess modifiable behaviors in adolescents. The inclusion of technologies and environment helps to adapt the questionnaire to current changes. The greatest deficit was observed in the technology use and physical activity domains; and girls were more sedentary.
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