Table 5 Correlations between fetal PFASs and maternal thyroid hormones.

	Maternal FT3		Maternal FT4		Maternal T3		Maternal T4		Maternal TSH
Fetal PFASs	Not-adjusted	Adjusted^a	Not-adjusted	Adjusted^a	Not-adjusted	Adjusted^a	Not-adjusted	Adjusted^a	Not-adjuste	d Adjusted^a
PFOA	−0.164**	−0.169*	−0.053**	−0.089	−0.072**	−0.069	−0.040**	−0.069	−0.073**	−0.065
PFNA	−0.260**	−0.243**	−0.095**	−0.101	−0.201**	−0.165*	−0.099**	−0.103	−0.039**	−0.045
PFDA	−0.264**	−0.264**	−0.091**	−0.126	−0.249**	−0.229**	−0.101**	−0.132	−0.124**	−0.135
PFUnA	−0.293**	−0.293**	−0.037**	−0.072	−0.246**	−0.213**	−0.028**	−0.045	−0.130**	−0.155
PFDoA	−0.268**	−0.255**	−0.090**	−0.097	−0.244**	−0.224**	−0.125**	−0.134	0.047*	0.061
PFHxS	−0.185**	−0.192*	0.045*	−0.006	−0.176**	−0.172*	−0.010	−0.034	−0.028**	−0,066
PFOS	−0.249**	−0.215**	−0.004**	−0.059	−0.248**	−0.203*	−0.071**	−0.108	−0.156*	−0.173*
6:2 FTS	−0.096	−0.122	−0.002	−0.001	−0.080	−0.076	−0.048	−0.056	0.117	0.127
NMeFOSAA	0.034*	0.060	−0.014*	−0.025	−0.046*	−0.025	−0.024	−0.023	0.001**	−0.007

Spearman correlation tests were used among the concentrations of PFASs and thyroid hormones with- and without adjustment influential covariates, which were selected from multivariate models. Four women with abnormal thyroid hormones levels were excluded. Units in pg/mL for 6:2 FTS and NMeFOSAA, ng/mL for other PFASs, pmol/mL for FT3 and FT4, nmol/mL for T3 and T4, μIU/mL for TSH. ^aAdjusted for maternal age, maternal prepregnancy BMI, maternal monthly income, maternal previous live births and neonatal type of delivery. *P < 0.05, **P < 0.01.

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