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Table 1 Distribution or BFRs, THs and enzyme activity in placenta samples (n = 95)

From: Brominated flame retardants in placental tissues: associations with infant sex and thyroid hormone endpoints

     

Percentile

 

Variable

MDL

Detection Frequency (%)

Geometric Mean

Min

33rd

67th

Max

PBDEs

 BDE-47

0.07

91.2

5.45

0.12

2.81

10.5

140.5

 BDE-99

0.07

68.6

2.02

0.16

1.35

3.47

222.8

 BDE-100

0.02

88.2

1.56

0.06

0.86

3.02

50.1

 BDE-153

0.01

93.1

2.23

0.07

1.69

3.38

513.2

 BDE-154

0.01

83.3

0.64

0.01

0.44

1.07

20.2

BDE-209

0.17

52.9

3.08

0.25

1.94

5.19

50.4

 ΣPBDEs

  

14.6

0.62

8.17

24.0

521.8

Phenolic compound

 2,4,6-TBP

0.05

100

15.8

1.31

7.83

22.7

316.1

 ΣBFRs

  

39.1

2.18

24.0

57.2

568.3

Thyroid hormones

 T4

0.002

100

28.1

11.8

25.1

32.6

53.6

 T3

0.002

100

0.37

0.10

0.32

0.45

0.84

 rT3

0.002

100

2.64

0.73

2.19

3.25

7.59

Enzyme activity

 DIO3

NA

100

0.74

0.01

0.58

1.12

3.86

 3,3’-T2 SULT activity

NA

100

3.32

0.35

2.34

4.59

19.2

 T3 SULT activity

NA

100

9.50

3.59

7.90

10.9

37.9

  1. Brominated flame retardant concentrations (ng/g lipid), thyroid hormone levels (ng/g ww), DIO3 activity (pmol rT3/mg protein/min), 3,3’-T2 SULT activity (pmol T2S/mg protein/min), and T3 SULT activity (fmol T3S/mg protein/min) measured in placenta tissue (n = 95). MDL indicates method detection limit. N = 95