10.6084/m9.figshare.6388535.v1 Samuel Dumith Samuel Dumith Aline Monteiro Aline Monteiro Monica Muraro Monica Muraro Mariane Dias Mariane Dias Kara Machado Kara Machado Manoela Oliz Manoela Oliz Juraci Almeida Cesar Juraci Almeida Cesar Evaluation of diagnostic criteria and cut-off points to predict underweight among adolescents from the Brazilian semiarid region SciELO journals 2018 Nutritional status Body mass index ROC curve Adolescent Anthropometry 2018-05-30 02:51:09 Dataset https://scielo.figshare.com/articles/dataset/Evaluation_of_diagnostic_criteria_and_cut-off_points_to_predict_underweight_among_adolescents_from_the_Brazilian_semiarid_region/6388535 <div><p>Abstract Objectives: to evaluate diagnostic criteria and to propose arm and calf circumference cutoff points to predict underweight in adolescents aged 13-19 years in two Brazilian municipalities of the semiarid region. Methods: underweight was defined as a Body Mass Index (BMI) of less than two z-scores, according to World Health Organization criteria (2007). Measurements of arm and calf circumferences were compared to BMI, and the diagnostic criteria for low-weight prediction were evaluated with the area under the Receiver Operating Characteristic (ROC) curve, coefficients of sensitivity, specificity, predictive values, kappa and diagnostic odds ratios. Results: the prevalence of underweight was 4.2% (CI95%= 3.3-5.0). The cutoff points for arm circumference were 22.1 cm (adolescents of both genders aged 13-15 years), and 25.1 cm and 24.0 cm, respectively, for males and females aged 16-19 years. The cutoff points for calf circumference were 30.0 cm in the first group and 31.8 cm and 31.0 cm, respectively, in the second age group. Conclusions: both anthropometric indicators analyzed evidenced a reasonable to excellent diagnostic capacity to predict underweight among adolescents.</p></div>