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Background:  Sex-related differences in cardiovascular parameters have been well documented in adults, and the impact of birthweight on cardiovascular health in later life has been acknowledged. However, data was limited regarding the association between birthweight and cardiovascular outcomes at an early age, and the sex-disparity in the association remained unclear.   Objective:  To investigate the association between birthweight and cardiovascular parameters in 4-year-old children. Furthermore, to explore whether sex-disparity exist in this association or in cardiovascular risk.   Methods:  Follow-up data from the Shanghai Birth Cohort (SBC) was analyzed. Detailed perinatal information including both maternal and offspring datum were recorded. Blood pressure, echocardiography, and anthropometry assessment were conducted during the follow-up of 4-year-old children. Linear regression models were used to analyze the association between birthweight and left ventricle (LV) structure and function changes in each sex and birthweight category. Multivariable logistic regression models were used to compare risk of left ventricular hypertrophy (LVH) in different birthweight subgroups.   Results:  Overall, macrosomia was significantly associated with thickened LV posterior wall thickness in systole [LVPWs, (β = 0.26, 95% CI: 0.06, 0.45)] and diastole [LVPWd, (β = 0.18, 95% CI: 0.06, 0.30)], and thickened interventricular septal thickness in diastole [IVSd, (β = 0.16, 95% CI: 0.05, 0.28)]. Boys with macrosomia showed a higher left ventricle mass index [LVMI, (β = 1.29, 95% CI: 0.14, 2.43)], thickened LVPWs (β = 0.30, 95% CI: 0.05, 0.56) and LVPWd (β = 0.21, 95% CI: 0.06, 0.36), and thickened IVSd (β = 0.23, 95% CI: 0.09, 0.36). However, no significant association of structural changes was found in girls. Furthermore, an increased risk of LVH was found solely in macrosomic boys (OR = 2.79, 95% CI: 1.17, 6.63).   Conclusion:  Children with macrosomia developed cardiovascular changes as early as 4 years of age. Macrosomia was associated with LV structural changes and higher LVH risk in pre-school-aged boys, while no association was found in girls.

Sex-Disparity in the Association Between Birthweight and Cardiovascular Parameters in 4-Year-Old Children: A Chinese Cohort Study