Abstract
Objectives:
To evaluate the effect of urbanization and ethnicity on correlations between waist circumference (WC) and obesity-related cardiovascular risk factors.
Methods:
1471 rural and urban Cameroonians, and 4185 French, from community-based studies, aged ⩾25 years, not treated for hypertension, diabetes and dyslipidemia participated in this study. Slopes of obesity-related abnormalities with WC were compared using an interaction term between place of residence and WC.
Results:
Women in urban Cameroon and men in France had significantly higher WC and BMI relative to their gender counterparts. Urban Cameroonians had higher abdominal adiposity, but lower BP and better metabolic profile than the French. WC was positively associated to all the obesity-related abnormalities in the three sites except to FPG (both genders) and blood lipids (women) in rural Cameroon. A 5 cm larger WC was associated with a higher increment among urban than rural Cameroonians for diastolic blood pressure (DBP) (women, 1.95/0.63 mm Hg; men, 2.56/1.44 mm Hg), HOMA-IR (women, 0.11/0.05), fasting plasma glucose (FPG) (men, 0.09/−0.01 mmol/l) and triglycerides (women, 0.06/0.01 mmol/l; men, 0.09/0.03 mmol/l), all P<0.05. A 5 cm larger WC was associated with a higher increment among urban Cameroon than French people for DBP (women, 1.95/1.28 mm Hg, P<0.01; men, 2.56/1.49 mm Hg, P<0.01), but with a lower increment for HOMA-IR (women, 0.11/0.14, P<0.05), FPG (women, 0.05/0.09 mmol/l), total cholesterol (women, 0.07/0.11 mmol/l; men, 0.10/0.13 mmol/l) and triglycerides (women, 0.06/0.11 mmol/l; men, 0.09/0.13 mmol/l) all P<0.05.
Conclusion:
Ethnicity and urbanization modify the association of WC with obesity-related metabolic abnormalities. WC cutoff points derived from Caucasians may not be appropriate for black Sub-Saharan Africans.
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Acknowledgements
The 1994 Cameroon study was supported by a grant from the European Union, contract NO TS3* CT92-0142. The insulin assays were undertaken in the Department of Medicine, University of Newcastle upon Tyne thanks to a generous support from Professor George Alberti. The DESIR study has been supported by INSERM contracts with CNAMTS, Lilly, Novartis Pharma and Sanofi-Aventis; by INSERM (Réseaux en Santé Publique, Interactions entre les determinants de la santé), the Association Diabète Risque Vasculaire, the Fédération Française de Cardiologie, La Fondation de France, ALFEDIAM, ONIVINS, Ardix Medical, Bayer Diagnostics, Becton Dickinson, Cardionics, Merck Santé, Novo Nordisk, Pierre Fabre, Roche, Topcon. The DESIR Study Group. INSERM U780: B Balkau, P Ducimetière, E Eschwège; INSERM U367: F Alhenc-Gelas; CHU D’Angers: Y Gallois, A Girault; Bichat Hospital: F Fumeron, M Marre; Centres d’Examens de Santé: Alençon, Angers, Caen, Chateauroux, Cholet, Le Mans, Tours; Institute de Recherche Médecine Générale: J Cogneau; General practitioners of the region; Institute inter-Regional pour la Santé: C Born, E Caces, M Cailleau, JG Moreau, F Rakotozafy, J Tichet, S Vol.
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Fezeu, L., Balkau, B., Sobngwi, E. et al. Waist circumference and obesity-related abnormalities in French and Cameroonian adults: the role of urbanization and ethnicity. Int J Obes 34, 446–453 (2010). https://doi.org/10.1038/ijo.2009.256
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DOI: https://doi.org/10.1038/ijo.2009.256
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