Table 2 Distribution of serum PFASs and thyroid hormones in the population of pregnant women (n = 379).

From: Associations between gestational exposure to perfluoroalkyl substances, fetal growth, and the mediation effect of thyroid hormones

Analytes (ng/mL)

LOD (ng/mL)

Detection frequency (%)

Arithmetic mean

5th

25th

50th

75th

95th

PFOA

0.156

100

1.41

0.19

0.77

1.40

2.05

2.96

PFOS

0.080

97.7

3.10

0.39

1.65

3.08

4.69

7.38

PFNA

0.120

100

1.64

0.18

0.65

1.55

2.38

6.54

PFDA

0.076

100

0.96

0.08

0.42

0.87

1.51

2.64

PFHxS

0.082

86.5

1.30

< LOD

0.52

1.12

1.89

3.95

PFHpS

0.096

97.2

1.10

0.12

0.46

0.87

1.48

3.75

FPOSA

0.062

92.6

5.70

< LOD

2.49

5.21

8.35

12.82

PFHpA

0.080

41.2

2.18

< LOD

< LOD

< LOD

1.58

3.09

Thyroid hormones

 TSH (mlU/L)

  

1.56

0.89

1.40

1.62

2.08

2.86

 FT3 (pmol/L)

  

4.68

2.40

4.38

4.68

5.42

6.82

 FT4 (pmol/L)

  

14.82

10.56

13.28

14.48

15.08

17.42

 TT3(nmol/L)

  

1.20

0.95

1.14

1.28

1.38

1.86

 TT4 (nmol/L)

  

132.8

124.6

130.2

133.5

134.8

140.8

 TG (nmol/L)

  

14.3

11.8

12.9

13.8

15.2

17.0

  1. Note: LOD, limit of detection.