KMID : 0384320090300090688
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Korean Journal of Family Medicine 2009 Volume.30 No. 9 p.688 ~ p.694
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The Relationship between Relative BMI Change and Height Growth among Overweight Children
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Son Young-Woo
Lee Ka-Young June Young-Bae
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Abstract
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Background: Many parents of overweight children have believed that their children¡¯s weight may be lost with the increase of their height. The purpose of this 2-year prospective study was to examine whether such belief is valid.
Methods: A total of 190 children (113 boys and 77 girls) aged 6-11 years who were overweight (BMI > 85th percentile of age and gender-specifi c 1999 Korean children standard) from two elementary schools were the subjects. Their height and weight were measured again after 2 years. Children and their parents completed questionnaires on eating habits and physical activity, and their attitude on weight in the beginning of study. Children¡¯s weight status was evaluated using relative BMI.
Results: Children¡¯s baseline relative BMI was 134.9 ¡¾ 13.8%. About 60% of the children reported weight loss attempt and 49% of their parents tried to persuade their child to lose weight. Children¡¯s BMI increased by 1.6 ¡¾ 2.1 kg/m2 and their relative BMI decreased by 1.2 ¡¾ 12.1% over 2 years. While children¡¯s eating habits and physical activity, and their attitude on the child¡¯s weight were not related to the 2-year relative BMI change, the child¡¯s age, gender, baseline relative BMI, and the 2-year height change were associated with the 2-year relative BMI change (R2 = 0.15, P < 0.001). The 2-year relative BMI increased with the 2-year height increase after controlling for the three predictors (B = 0.86, SE = 0.28, P = 0.002).
Conclusion: We found the 2-year height change positively associated with the 2-year relative BMI change among schoolaged overweight children. Then, the belief that children¡¯s weight status may be improved with the increase of their height should be denied.
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KEYWORD
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Overweight Children, Parent, Height Increase, Relative BMI, Prospective Study
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