Validation of self-reported measures of body mass and stature in college students
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Abstract
Introduction: The analysis of the validity of the measures referred of body weight and height are essential for use in epidemiological surveys. Objective: The objectives of this study were: i) to estimate the validity of the measures referred of body weight and height, and body mass index (BMI) calculated these measures; ii) to analyze the association between the explanatory variables (link with the university and sociodemographic) with the error between reported and measured body mass and height, and BMI calculated based measures. Methods: It was carried out a cross-sectional study, conducted with students (calculated sample: 100) of a public university. The information referred to body weight and height was obtained through a questionnaire and assessment of the measures undertaken then. It was calculated the excess body weight (BMI: ≥25.0 kg/m2) and errors between reported and measured. The analysis included tests for variables in quantitative and qualitative scale. Results: The study included 146 students and the correlation between reported and measured in quantitative scale were satisfactory. The level of agreement for excess body weight was stronger in men (kappa=0.76) and women (kappa=0.74). BMI was overestimated by men and women over the age quartile and underestimated by women with greater exposure time to the university. Conclusion: These measures presented satisfactory level of validity, and the factors associated with errors of the measures mentioned were students of higher age group and women with longer exposure time at the university.
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