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HK J Paediatr (New Series)
Vol 14. No. 2,
2009
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HK J Paediatr (New Series) 2009;14:96-102
Original Article
New Skinfold-thickness Equation for Predicting Percentage Body Fat in Chinese Obese Children
DFY Chan, AM Li, HK So, J Yin, EAS Nelson Department of Paediatrics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China DFY Chan (陳鳳英) FHKCPaed, FHKAM(Paed) AM Li (李民瞻) MD, FHKCPaed, FHKAM(Paed) HK So (蘇鴻鈞) MBBS, PHD J Yin (殷愛珍) MSc EAS Nelson (倪以信) MD, FHKCPaed, FHKAM(Paed) Correspondence to: Dr DFY Chan Received December 5, 2008
Abstract Objective: To validate existing skinfold thickness predicting equations and to develop an equation for estimating body fat composition in obese Chinese children. Design: Cross-sectional study. Subjects: One hundred and thirty-eight Chinese obese children, 37 girls and 101 boys with mean age and body mass index (BMI) of 11.9 years (SD 2.7) and 29.7 Kg/m2 (SD 4.8) respectively, referred for medical assessment were recruited. Measurements and methods: All subjects underwent physical examination and anthropometric measurement. Total percentage of body fat (%FM) was measured by dual-energy X-ray absorptiometry (DEXA) scan (%FM-DEXA). Three skinfold-thickness predicting equations for estimating %FM (%FM-SF) were compared with the measured %FM-DEXA. Results: The mean male and female percentage body fat measured by DEXA were 36.6% (SD 6.8) and 39.0% (SD 4.2) respectively. There was significant gender difference in %FM-DEXA (p=0.05). The Durnin & Rahaman equation (%FM-DR-SF) best predicted %FM in girls with a mean difference of %FM-DEXA-DR-SF of 0.76% (SD 4.0) but overestimated %FM in boys with a mean difference of -1.01% (SD 5.7). Lohman equation was the best in estimating %FM in boys. The mean differences of %FM-DEXA-L-SF were -0.94% (SD 5.62) and -2.58% (SD 4.5) for boys and girls respectively. The gender difference as documented by DEXA was only demonstrated by the Lohman equation. Slaughter equation overestimated %FM in both genders. The mean differences %FM-DEXA-Sla-SF was -8.1% (SD 8.6%) in boys and -5.2% (SD 5.28%) in girls. A new predicting equation was derived for local use. Conclusion: Existing equations are inaccurate in estimating percentage of body fat in obese Chinese children. A specific equation based on skinfold thickness was derived for estimation of %FM in obese Chinese children. Keyword : Body fat distribution; Children; DEXA; Obese; Skinfold-thickness Abstract in Chinese
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