FIG. 2.

Adjusted geometric mean TSH and Tg concentration by iodine status (as iodine-to-creatinine ratio, μg/g). The error bars are the confidence intervals of the geometric mean. Results are computed by back transformation of estimated marginal means from a linear mixed model (on log-transformed data), controlling for the effects of gestational week, season (winter/summer), body mass index (<25 vs. ≥25 kg/m²), smoking status (never vs. ex-smoker), ethnicity (Caucasian vs. other), and maternal age. ^aSignificantly higher than the 150–249 μg/g group (p < 0.001) and the ≥250 μg/g group (p < 0.001). ^bSignificantly higher than the 150–249 μg/g group (p = 0.005) and the ≥250 μg/g group (p = 0.002).