Urinary iodine in early pregnancy is associated with subclinical hypothyroidism in Tianjin, China: an observational study

Table 3 Comparison of urinary iodine concentration (UIC) frequency distribution between the euthyroidism and subclinical hypothyroidism groups with negative anti-thyroid autoantibodies

Group	UIC (μg/L) frequency distribution			Total
Group	<150	150–249	≥250	Total
Euthyroidism	20	18	2	40
Subclinical hypothyroidism	7	6	5	18
Total	27	24	7	58
P	0.433	0.404	0.025	0.066

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