Association between maternal education and blood pressure: mediation evidence through height components in the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil)

<p><b>Background:</b> Maternal education influences skeletal growth and offspring adult blood pressure (BP). Height components are negatively associated with BP in high-income countries.</p> <p><b>Aim:</b> To evaluate the association between maternal education and offspring adult systolic and diastolic BP (SBP/DBP), assessing whether different height components might mediate such an association.</p> <p><b>Subjects and methods:</b> Simple mediation modelling was used to evaluate the maternal education-offspring SBP/DBP association, estimating the contribution of offspring height components, in a cross-sectional sample of 13 571 Brazilians aged 34–75 from the ELSA-Brasil study.</p> <p><b>Results:</b> After full adjustment for confounders, and compared to participants whose mothers received low education, those whose mothers received high education had, on average, 0.2 mm Hg lower SBP (95% CI = −0.274, −0.132), as result of the link between maternal education and offspring adult height which, in turn, influenced SBP. Thus, 18–26% of the maternal education-SBP association occurred indirectly, through height, trunk and leg length, alternatively.</p> <p><b>Conclusions:</b> Better maternal education might influence higher leg and trunk lengths in offspring, which, in turn, might contribute to prevent higher BP in adults. The negative height-BP association reported in high-income countries is also present in a middle-income country with more recent economic development.</p>