Assessment of Iodine Status among Pregnant Women and Neonates Using Neonatal Thyrotropin (TSH) in Mainland China after the Introduction of New Revised Universal Salt Iodisation (USI) in 2012: A Re-Emergence of Iodine Deficiency?

Table 1

Sociodemographic characteristics and biochemical results of participants by trimesters.

	Trimesters			value	Total (n = 3060)
	1st (n = 1183)	2nd (n = 1729)	3rd (n = 148)
Age (years)	28.5 ± 4.0	28.2 ± 4.1	27.2 ± 4.0	0.001	28.3 ± 4.1
Weeks of gestation at recruitment	11.8 ± 2.1	17.2 ± 3.2	32.9 ± 3.3	<0.001	15.9 ± 5.4
TSH (mIU/L)	1.76 ± 3.35	1.94 ± 1.73	2.14 ± 1.41	0.069	1.88 ± 2.48
FT3 (pmol/L)	4.64 ± 1.08	4.43 ± 1.74	4.03 ± 1.43	<0.001	4.49 ± 1.51
FT4 (pmol/L)	16.90 ± 3.67	15.44 ± 5.42	13.51 ± 2.84	<0.001	15.91 ± 4.79