|Support type:||Scholarships in Brazil - Doctorate|
|Effective date (Start):||May 01, 2012|
|Effective date (End):||February 28, 2015|
|Field of knowledge:||Health Sciences - Nutrition - Nutritional Analysis of Population|
|Principal researcher:||Jose Augusto de Aguiar Carrazedo Taddei|
|Grantee:||Jonas Augusto Cardoso da Silveira|
|Home Institution:||Escola Paulista de Medicina (EPM). Universidade Federal de São Paulo (UNIFESP). Campus São Paulo. São Paulo , SP, Brazil|
National health surveys are important tools for the recognition of social, demographic and epidemiological characteristics of population, supporting the planning, implementation and evaluation of effective public policies. The PNDS of 1996 and 2006, together with the 1974/75' (ENDEF) and 1989' (PNSN) surveys, have been fulfilling their role, allowing the comparison of their prevalence estimates over time in national and international level, given the standardization of the sampling methods and data collection.This research aims to analyze and identify factors associated with preschool (24-59 months) children´s weight gain, using the variable "Conditional Weight Gain" (CWG), which represents a child's deviation from his/her expected weight gain, given birthweight, and is expressed in standard deviations (SD). CWG is the standardized residuals obtained from a sex-specific linear regression adjusted for weight-for-age Z-score (WAZ) at birth and age at survey, where WAZ at survey is the dependent variable. This approach overcomes some important limitations in the analyses of weight gain, such as the statistical phenomenon of regression to the mean, where extreme values tend to move closer to the sample mean, incorporates the different ages at survey´s date, and deals with the collinearity of repeated weight measures. Furthermore, we will advance the studies on secular trends of nutritional disorders made by the research group analyzing the secular trends of overweight among preschool children using data from the 1989, 1996 and 2006 national health surveys.The rational of this proposal are the strong evidences that in early life environmental factors play important role in children's health. The recognition and measurement of factors associated with nutritional disorders represents new information for the comprehension of malnutrition and overweight determinants for the Brazilian children, as well as for the evaluation of program as policies focused on nutrition and health. Moreover, this is a low-cost and wide-ranging proposal, since it does not demand additional data collection, allowing estimates of Brazilian under five population and generating scientific knowledge from a partially explored data set that consumed a fair amount of resources in a countrywide field study.