Table 3

Urinary iodine, estimated iodine intake and sodium excretion values by salt intake equivalent categories

	24-hour urinary sodium excretion
	All n=874*		Salt <5 g/day n=307		Salt 5–9 g/day n=322		Salt >9 g/day n=245		P value
	Median	IQR	Median	IQR	Median	IQR	Median	IQR	P value
Sodium (mg/day)	2471	1434, 3506	1393	1068, 1719	2638	2219, 3057	4799	3607, 5993	<0.001
Salt (g/day)	6.3	3.7, 9.0	3.6	2.8, 4.5	6.8	5.7, 7.9	12.3	9.3, 15.4	<0.001
UIC (µg/L)	130	58, 202	102	32, 172	131	56, 206	149	78, 220	<0.001
24-hour UIE (µg/day)	117	48, 186	74	37, 111	119	57, 181	195	117, 273	<0.001
Estimated iodine intake (µg/day)†	127	52, 202	80	40, 120	130	63, 197	212	127, 297	<0.001
% with daily iodine intake below EAR for iodine (95 µg/day)	37.1		58.4		34.7		13.5

*One individual in subsample with missing 24-hour sodium analysis. Data shown as median and IQR (25th, 75th percentiles). Continuous variables compared using independent samples Kruskal-Wallis test.
†Daily iodine intake assumed as 24-hour UIE (µg/day)/0.92 to account for bioavailability.
EAR, Estimated Average Requirement; UIC, spot urinary iodine concentration; UIE, 24-hour urinary iodine excretion.