Sampling plan of the Brazilian National Survey on Child Nutrition (ENANI-2019): a population-based household survey

The article describes methodological aspects in defining the study population, sampling plan, and sample weigthing calibration of effective Brazilian National Survey on Child Nutrition (ENANI-2019). This population-based household survey assessed breastfeeding dietary intake, anthropometric assessment nutritional status, micronutrient deficiencies by blood biomarkers children under five years age. data were obtained with a probability sample, stratification geographic regions country clustering census enumeration areas (CEAs). was calculated at 15,000 households distributed 1,500 CEAs, 300 allocated each Brazil’s major 10 eligible per CEA, sampled using inverse sampling. required population parameters thus estimated to reach study’s objectives. basic design weights as probabilities households’ inclusion study. Imputation used compensate for non-response items target variables, except biomarkers. Finally, totals 60 post-strata, defined cross-classification following variables: region, sex, final included 14,558 residing 12,524 households, 1,382 CEAs 26 states Brazil Federal District. from ENANI-2019 will support strategies promotion implementation public policies