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Objective: To examine socio-economic inequalities in malnutrition among Colombian children and adolescents, and to assess the contribution of individual-, household-and community-level factors to those inequalities. Design: Cross-sectional data were used from two sources: 2005 Colombian Demographic and Health Survey and 2005 Colombian census. Malnutrition outcomes included stunting and overweight. Multilevel Poisson models were used to estimate the association between individual, household and contextual characteristics and malnutrition. Changes in prevalence ratios of the poorest quintile (v. richest) were compared to assess the contribution of different characteristics to inequalities in malnutrition. Setting: Population-based, representative of Colombia. Subjects: Children and adolescents ,18 years of age (n 30 779) from the Colombian Demographic and Health Survey. Results: Children and adolescents living in the poorest households were close to five times more likely to be stunted, while those from the richest households were 1?3-2?8 times more likely than their poorest counterparts to be overweight. Care practices and household characteristics, particularly mother's education, explained over one-third of socio-economic inequalities in stunting. The proportion explained by access to services was not negligible (between 6 % and 14 %). Access to sanitation was significantly associated with a lower prevalence of stunting for all age groups. Between 14 % and 32 % of socio-economic disparities in overweight were explained by maternal and household characteristics. Mother's overweight was positively associated with overweight of the child. Conclusion: Socio-economic inequalities in stunting and overweight coexist among children and adolescents in Colombia. Malnutrition inequalities are largely explained by household characteristics, suggesting the need for targeted interventions.

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