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The role of offspring’s birthweight on the association between pre-pregnancy obesity and offspring’s childhood anthropometrics: a mediation analysis

Published online by Cambridge University Press:  10 January 2019

A. A. Adane Open the ORCID record for A. A. Adane [Opens in a new window] ,
L. R. Tooth  and
G. D. Mishra
A. A. Adane*
Affiliation:
The University of Queensland, School of Public Health, Centre for Longitudinal and Life Course Research, Herston QLD, Australia
L. R. Tooth
Affiliation:
The University of Queensland, School of Public Health, Centre for Longitudinal and Life Course Research, Herston QLD, Australia
G. D. Mishra
Affiliation:
The University of Queensland, School of Public Health, Centre for Longitudinal and Life Course Research, Herston QLD, Australia
*
Author for correspondence: A. A. Adane, The University of Queensland, School of Public Health, Centre for Longitudinal and Life Course Research, Herston, QLD 4006, Australia. E-mail: akilew.adane@uq.net.au
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Abstract

While birthweight of offspring is associated with pre-pregnancy body mass index (BMI) and later risk of obesity, its mediating effect between the association of maternal pre-pregnancy BMI and offspring’s childhood anthropometrics has rarely been investigated. This study aimed to examine whether offspring birthweight is a mediator in the association between pre-pregnancy BMI and offspring’s childhood anthropometrics. The study included 1,618 mother–child pairs from the Australian Longitudinal Study on Women’s Health and Mothers and their Children’s Health Study. Children’s anthropometrics [mean age 8.6 (s.d. =3.0) years] were calculated from the mothers’ self-reported child weight and height measures. G-computation was used to estimate the natural direct and indirect (via birthweight) effects of pre-pregnancy BMI. In the fully adjusted model for maternal sociodemographic and lifestyle factors, the natural direct effects of pre-pregnancy obesity on child BMI-for-age, height-for-age, weight-for-age and weight-for-height outcomes were, β (95% confidence interval, CI), 0.75 (0.55, 0.95), 0.13 (−0.07, 0.32), 0.62 (0.44, 0.80) and 0.57 (0.24, 0.90), respectively. The corresponding natural indirect effects were 0.04 (−0.04, 0.12), −0.01 (−0.09, 0.07), −0.01 (−0.08, 0.07) and 0.09 (−0.05, 0.23). Similar results were observed for pre-pregnancy overweight and pre-pregnancy BMI as a continuous scale. Most of the effect of pre-pregnancy obesity on childhood weight-related anthropometric outcomes appears to be via a direct effect, not mediated through offspring’s birthweight.

Keywords

Pre-pregnancy obesitybirthweightchildhood anthropometricslinear growthmediation analysis
Type
Original Article
Information
Journal of Developmental Origins of Health and Disease , Volume 10 , Issue 5 , October 2019 , pp. 570 - 577
Copyright
© Cambridge University Press and the International Society for Developmental Origins of Health and Disease 2019 

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