. 2017 Mar 1;27(3):426–433. doi: 10.1089/thy.2016.0322

Table 2.

Linear Mixed Model Exploring the Interaction Between Iodine Status and Week of Gestation on TSH and Tg Concentrations

		TSH		Tg
	Urinary iodine-to-creatinine ratio group	Geometric mean ratio [CI]^a	p-Value for interaction^b	Geometric mean ratio [CI]^a	p-Value for interaction^b
One week increase in gestation	<150 μg/g	1.020 [1.016–1.023]	0.010	1.006 [1.003–1.008]	0.012
	≥150 μg/g	1.011 [1.001–1.021]		0.999 [0.992–1.007]

^{^a}

Exponential of β from linear mixed model, controlling for the effects of season (winter/summer), body mass index (<25 vs. ≥25 kg/m²), smoking status (never vs. ex-smoker), ethnicity (Caucasian vs. other), and maternal age.

^{^b}

p-Value for the difference in slope (<150 vs. ≥150 μg/g).

CI, confidence interval.