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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