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:: Volume 6, Issue 3 (7-2015) ::
Caspian J Intern Med 2015, 6(3): 128-133 Back to browse issues page
Sex difference of biological variation of BMI and waist circumference with age in Iranian adults: A predictive regression model
Karimollah Hajian-Tilaki, Behzad Heidari *
Babol university of Medical Sciences , bheidari6@gmail.com
Abstract:   (7891 Views)

 Background: Background and Objectives: The biological variation of body mass index (BMI) and waist circumference (WC) with age may vary by gender. The objective of this study was to investigate the functional relationship of anthropometric measures with age and sex.

Methods: The data were collected from a population-based cross-sectional study of 1800 men and 1800 women aged 20-70 years in northern Iran. The linear and quadratic pattern of age on weight, height, BMI and WC and WHR were tested statistically and the interaction effect of age and gender was also formally tested.

 Results: The quadratic model (age2) provided a significantly better fit than simple linear model for weight, BMI and WC. BMI, WC and weight explained a greater variance using quadratic form for women compared with men (for BMI, R2=0.18, p<0.001 vs R2=0.059, p<0.001 and for WC, R2=0.17, p<0.001 vs R2=0.047, p<0.001). For height, there is an inverse linear relationship while for WHR, a positive linear association was apparent by aging, the quadratic form did not add to better fit.

 Conclusion: These findings indicate the different patterns of weight gain, fat accumulation for visceral adiposity and loss of muscle mass between men and women in the early and middle adulthood.


Keywords: Body mass index, Waist circumference, Waist to hip ratio, Quadratic form, Adults
Full-Text [PDF 179 kb]   (2150 Downloads)    
Type of Study: Original Article | Subject: Health
Received: 2014/12/3 | Accepted: 2015/05/20 | Published: 2015/05/25
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Hajian-Tilaki K, Heidari B. Sex difference of biological variation of BMI and waist circumference with age in Iranian adults: A predictive regression model. Caspian J Intern Med. 2015; 6 (3) :128-133
URL: http://caspjim.com/article-1-442-en.html

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Volume 6, Issue 3 (7-2015) Back to browse issues page
Caspian Journal of Internal Medicine
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