Table 4.

Associations between infant UIC and maternal indicators of iodine nutrition in Linear Mixed Models

(Coefficient and 95 % confidence intervals)

	Infant UIC
	Unadjusted			Adjusted§
Independent variables	Coefficient	95% CI	P	Coefficient	95% CI	P
Maternal UIC:Cr*	0·31	0·10, 0·51	0·003	0·33	0·12, 0·54	0·002
Maternal iodine intake†	0·29	0·17, 0·41	< 0·001	0·30	0·18, 0·42	< 0·001
BMIC‡	0·35	0·06, 0·65	0·018	0·35	0·05, 0·66	0·022

UIC, urinary iodine concentration; UIC:Cr, urinary iodine-to-creatinine ratio; BMIC, breast milk iodine concentration.

^*The model includes infant UIC and maternal UIC/Cr at two time points (ages 3 and 6 months).

^†The model includes infant UIC and maternal estimated total iodine intake (foods and supplements) at three time points (ages 3, 6 and 11 months).

^‡The model includes infant UIC and BMIC at one time point (age 3 months).

^§Covariates in adjusted model: maternal pre-pregnancy BMI.