Fig. 2

The placental iodine concentrations ranged from 12.4 to 24.1 μg/kg for the lowest tertile (n = 158), 24.1 to 27.6 μg/kg for the middle tertile (n = 157), and 27.6 to 40.5 μg/kg for the highest tertile (n = 156). n presents the number of women diagnosed with GDM in each tertile. Most mothers with GDM belonged to the lowest tertile (n = 14). Only two and four mothers with GDM were in the middle and highest tertiles, respectively. The odds ratio with 95% confidence intervals (95%CI) is presented on a log scale. Estimates and 95%CI for the middle and highest tertiles were calculated by contrasting them with the lowest tertile. Corrections were made for maternal education, hypertension, smoking status, pre-pregnancy BMI, maternal age at delivery, gestational weight gain, alcohol use, neonatal parity, gestational age, ethnicity, and sex of the neonate. On the y-axis, in red, the estimates are given