The prevalence of overweight and obesity was higher among adolescents than among younger schoolaged children. However, in these reports, different growth references (Thai or NCHS or WHO) and classification systems (either +2SD or >97 percentile as cut-offs) were
used, making comparisons difficult. Using International Obesity Task Force (IOTF) criteria, the NHES4 (2008-2009) found that prevalences of overweight and obesity
among preschool (2-4 years) and school-aged (6-14 years) children were comparable to those of developed countries in the region. Prevalence of overweight and obesity among pre-schoolers was 13.2% for both boys and girls; among school-age children, the prevalence was 16.7% for boys and 15.2% for girls.
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