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 3

Biochemical results of participants by year of study.

	2016 (n = 1657)	2017 (n = 1403)	value
Age	27.9 ± 3.9	28.6 ± 4.2	<0.001
Weeks of gestation at recruitment	16.0 ± 5.3	15.7 ± 5.6	0.254
Average length of pregnancy (gestational age at birth)	39.1 ± 1.5	39.1 ± 1.5	0.130
TSH	1.82 ± 1.62	1.96 ± 3.21	0.115
FT3	4.53 ± 1.50	4.44 ± 1.53	0.091
FT4	16.14 ± 4.57	15.63 ± 5.03	0.003
Neonatal TSH (mIU/L)	4.89 ± 2.32	4.84 ± 1.69	0.512
Prevalence of neonatal TSH values >5 mIU/L (%)	29.8	28.9	0.592
Neonatal weight (g)	3373 ± 452	3342 ± 457	0.058
Prevalence of LBW (%)	2.8	3.6	0.253
Neonatal APGAR score	9.98 ± 0.24	9.99 ± 0.17	0.647