Abstract
Maternal smoking during pregnancy has detrimental effects on fetal development. The current review examined the differences in offspring’s bone mineral density (BMD) between mothers smoked during pregnancy and those who did not. A systematic review and meta-analysis on the studies investigating the influence of maternal smoking during pregnancy on children or neonates’ bone measures published up to October 30, 2018, was performed. BMD results measured at different body sites were pooled and then fixed or random effect models were used based on the presence of heterogeneity. The desired pooled effect size was the offspring’s BMD mean difference with 95% confidence interval between smoker and non-smoker mothers. Sensitivity analysis was performed for birth weight and current weight, two important mediator/confounders causing heterogeneity. Overall, eight studies consisting of 17,931 participants aged from infancy to 18 years were included. According to the fixed effect model, the mean of BMD in offspring whose mothers smoked during pregnancy was 0.01 g/cm2 lower than those with non-smoker mothers (95% CI = − 0.02 to − 0.002). However, subgroup meta-analysis adjusted for birth weight and current weight demonstrated no significant mean difference between BMD of children with smoker and non-smoker mothers (d = 0.06, 95% CI = −0.04 to 0.16, p value = 0.25 and d = − 0.005, 95% CI = − 0.01 to 0.004, p value = 0.28, respectively). According to available studies, it is suggested that maternal smoking during pregnancy does not have direct effect on the offspring’s BMD. Instead, this association might be confounded by other factors such as placental weight, birth weight, and current body size of children.
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TITLE: (“Bone Density” OR “Bone Densities” OR “Density, Bone” OR “Bone Mineral density” OR “Bone Mineral Densities” OR “Density, Bone Mineral” OR “Bone Mineral Content” OR “Bone Mineral Contents” OR “Bone mass” OR BMD OR BMC) AND TITLE: (“Maternal smoking” OR “Maternal smoke” OR “Maternal cigarette” OR “ Maternal cigarette smoke” OR “ Maternal cigarette smoking” OR “Pregnancy smoking” OR “Pregnancy smoke” OR “Pregnancy cigarette” OR “Pregnancy cigarette smoke” OR “Pregnancy cigarette smoking” OR “Prenatal smoking” OR “Prenatal smoke” OR “Prenatal cigarette” OR “ Prenatal cigarette smoke” OR “Prenatal cigarette smoking”).
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Baradaran Mahdavi, S., Daniali, S.S., Farajzadegan, Z. et al. Association between maternal smoking and child bone mineral density: a systematic review and meta-analysis. Environ Sci Pollut Res 27, 23538–23549 (2020). https://doi.org/10.1007/s11356-020-08740-1
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DOI: https://doi.org/10.1007/s11356-020-08740-1