Fig. 1From: Maternal urinary manganese and risk of low birth weight: a case–control studyThe relationship between maternal urinary manganese concentration (μg/g creatinine) and risk of LBW, adjusted for gestational age, household income, pre-pregnancy body mass index, parity, passive smoking, and gestational hypertension. The risk estimate is indicated by the solid line, and the 95 % confidence intervals are represented by the dashed linesBack to article page