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Construction of Growth Charts of Body Mass Index for Adults in Pakistan: A Quantile Regression Approach

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Author(s): Muhammad Aslam | Saima Altaf

Journal: Pakistan Journal of Nutrition
ISSN 1680-5194

Volume: 10;
Issue: 12;
Start page: 1179;
Date: 2011;
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Keywords: BMI | growth charts | growth norms | obesity | quantile regression

ABSTRACT
Available literature explores that having knowledge about an individuals body weight status, namely about the body mass index (BMI), remains helpful to overcome the problem of obesity. BMI growth chart may be taken as a useful tool in order to know an individuals obesity status in terms of BMI. In the present article, we construct growth charts of BMI for males and females, separately using quantile regression approach. Cross-sectional data comprising of 2000 adult (aged 14 years or more) individuals, both males and females were taken from Multan city as a case study. Following some available studies, we take six powers of the variable age as covariates while running the quantile regression with logarithm of BMI as dependent variable. Thus, obtained plots of BMI against different ages for different quantile settings, are the resultant growth charts. Referring the constructed BMI growth charts, it is reported that BMI for females is quite sensitive to age and the females gradually continue to put on their weights as compared to male especially, for middle ages of 30-45. BMI growth norms, expressed as 5th, 50th and 95th centiles are also discussed and males are reported to be heavier than those of females in their teen-ages.

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