Computational protocol: Accuracy of the WHO’s body mass index cut-off points to measure gender- and age-specific obesity in middle-aged adults living in the city of Rio de Janeiro, Brazil

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Protocol publication

[…] Descriptive statistics were expressed as the mean ± standard deviation, and post hoc power (1 - beta error level) sample analysis determined the effect size; these analyses were conducted in G*Power software version 3.1.9.2 (University Kiel, Germany). Lilliefors test confirmed the normality of the sample distribution. Age- and gender-specific percentile values of BMI that corresponded to the percentage of body fat categories were estimated, identifying equivalent percentiles and proportions of BMI distribution. This procedure returned approximately the same prevalence estimates as the percentage body fat categories. ROC curves were generated to identify the optimal cut-off values of BMI according to age categories and for the whole group, with better sensitivity and specificity corresponding to a particular threshold in men and women. All procedures assumed P<0.05 for statistical significance and were performed in SPSS software version 18.0 (SPSS, USA). […]

Pipeline specifications

Software tools G*Power, SPSS
Application Miscellaneous