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Magnesium concentrations during the first day of life in newborns with magnesium supplementation during pregnancy. * If 95% CIs were not reported in the study, then the 95% CIs were calculated as follows: mean ± (1.96 × SD). ‡ Reference line and 95% CI derived using only studies reporting both mean and SD data. Overall statistic for heterogeneity: I2 = 99.5% (p < 0.001). CI: confidence interval; n: number of infants; SD: standard deviation.
