Do ethnic differences in cord blood leptin levels differ by birthweight category? Findings from the Born in Bradford cohort study

West, J., Wright, J., Fairley, L., Sattar, N. , Whincup, P. and Lawlor, D. A. (2014) Do ethnic differences in cord blood leptin levels differ by birthweight category? Findings from the Born in Bradford cohort study. International Journal of Epidemiology, 43(1), pp. 249-254. (doi:10.1093/ije/dyt225)

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Abstract

Background: There is evidence that South Asian individuals have higher fat mass for a given weight than Europeans. One study reported that the greater fatness for a given birthweight may increase with increasing birthweight, suggesting that any attempt to increase mean birthweight in South Asians would markedly increase their fatness.

Objective: Our objective was to examine whether differences in cord leptin values between White British and Pakistani infants vary by birthweight category.

Method: We examined the difference in cord leptin levels between 659 White British and 823 Pakistani infants recruited to the Born in Bradford cohort study, by clinical categories and thirds of the birthweight distribution.

Results: Pakistani infants had a lower mean birthweight but higher cord leptin levels than White British infants [ratio of geometric mean (RGM) of cord leptin adjusted for birthweight = 1.36 (95% CI 1.26, 1.46)]. Birthweight was positively associated with cord leptin levels in both groups, with no evidence that the regression lines in the two groups diverged from each other with increasing birthweight. The relative ethnic difference in cord leptin was similar in low (<2500 g), normal and high (≥4000 g) birthweight infants (P-value for interaction = 0.91). It was also similar across thirds of the birthweight distribution [RGM (95% CI) in lowest, mid and highest thirds were 1.37 (1.20, 1.57), 1.36 (1.20, 1.54) and 1.31 (1.16, 1.52), respectively, P-interaction = 0.51].

Conclusions: We found marked differences in cord leptin levels between Pakistani and White British infants but no evidence that this difference increases with increasing birthweight.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sattar, Professor Naveed
Authors: West, J., Wright, J., Fairley, L., Sattar, N., Whincup, P., and Lawlor, D. A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:International Journal of Epidemiology
Publisher:Oxford University Press
ISSN:0300-5771
ISSN (Online):1464-3685
Copyright Holders:Copyright © 2013 The Authors
First Published:First published in the International Journal of Epidemiology 43(1):249-254
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
505711The intrauterine environment and differences in adiposity and insulin resistance between South Asian and European populationsNaveed SattarBritish Heart Foundation (BHF)PG/09/036/27380RI CARDIOVASCULAR & MEDICAL SCIENCES