[Association between waist circumference and body mass index of Brazilian women: NDHS 2006].

The scope of this study was to evaluate the association between waist circumference (WC) and body mass index (BMI) of Brazilian women of childbearing age studied in the most recent National Demographic and Health Survey (NDHS), in 2006. This study is an excerpt of the NDHS, which is a home-based cross-sectional study. The nutritional status of women was assessed by WC and BMI, considering excess weight to be BMI = 25 Kg/m2 and WC risk to be = 80 cm. To evaluate the statistical significance, Poisson Regression was applied to identify factors associated with WC risk in women with or without excess weight, presenting the p-value corresponding to the Wald test for heterogeneity or linear trend. Of the 14,101 women studied, 45.8% were overweight and 55.5% at WC risk. Regarding the association between BMI and WC, it was found that 23.5% of women who were not overweight showed WC risk. After a stratified analysis by BMI, the prevalence of WC risk among women without excess weight was greatest in the Northeast, 26.0%, and the Southeast, 24.5%, while the South region presented the lowest prevalence at 18.5%. It follows that the anthropometric WC and BMI measures should be used concomitantly since the use of only one of these measures may overlook individuals at risk for various diseases.