Open AccessWhich modifiable prenatal factors mediate the relation between socio‐economic position and a child's weight and length at birth?
Author(s) -
Ballon Morgane,
Botton Jérémie,
Forhan Anne,
LauzonGuillain Blandine,
Melchior Maria,
El Khoury Fabienne,
Nakamura Aurélie,
Charles Marie Aline,
Lioret Sandrine,
Heude Barbara
Publication year - 2019
Publication title -
maternal and child nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 63
eISSN - 1740-8709
pISSN - 1740-8695
DOI - 10.1111/mcn.12878
Subject(s) - medicine , pregnancy , birth weight , body mass index , demography , obstetrics , cohort , endocrinology , genetics , sociology , biology
Although several studies have shown a positive association between socio‐economic position and size at birth, not enough is known about the modifiable factors that may be involved. We aimed to investigate whether maternal prepregnancy body mass index (BMI), smoking, diet, and depression during pregnancy mediate the positive association between maternal education and birth size. Weight and length z ‐scores specific for gestational age and sex were calculated for 1,500 children from the EDEN mother–child cohort. A mediation analysis of the associations between maternal education and birth size was conducted with a counterfactual method, adjusted for recruitment centre, parity, maternal height, and age. In the comparison of children of mothers with low versus intermediate education levels, maternal smoking during pregnancy explained 52% of the total effect of education on birth weight. Similar findings were observed with birth length z ‐score (37%). The comparison of children of mothers with high versus intermediate education levels yielded a non‐significant total effect, which masked opposite mediating effects by maternal BMI and smoking during pregnancy on both birth weight and length. Prepregnancy BMI and maternal smoking during pregnancy mediate the positive association between maternal education and birth weight and length z ‐scores. These mediators, however, act in opposite directions, thereby masking the extent to which healthy prenatal growth is socially differentiated.