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Table 1 Characteristics of the study sample from the NICHD fetal Growth Studies–Singletons (n = 260)

From: Concentrations of persistent organic pollutants in maternal plasma and epigenome-wide placental DNA methylation

  Mean ± SD or N (%) or Median [p25-p75]
Maternal age, years 27.6 ± 5.2
Gestational age at enrollment, weeks 12.7 ± 0.9
Maternal pre-pregnancy BMI, kg/m2 23.3 ± 2.9
Maternal race/ethnicity
 Non-Hispanic White 67 (25.8)
 Non-Hispanic Black 59 (22.7)
 Hispanic 86 (33.1)
 Asians 48 (18.5)
Parity
 Nulliparous 126 (48.5)
 Parous 134 (51.5)
Infant sex
 Male 130 (50.0)
 Female 130 (50.0)
Maternal POP plasma concentration
Chemical class Chemicals  
  OCPs (ng/g)   HCB 6.28 [3.50, 10.10]
    Trans-nonachlor 4.25 [2.48, 7.35]
  p,p′-DDE 85.26 [54.09, 218.81]
    Σ OCPs 98.83 [65.70, 228.20]
  PBDEs (ng/g)   PBDE 47 8.64 [3.60, 16.67]
  PCBs (ng/g)   PCB 138/158 5.03 [2.78, 8.17]
    PCB 153 5.74 [3.18, 10.09]
    PCB 180 3.30 [1.90, 5.25]
    Σ PCBs 14.13 [8.06, 23.24]
  PFASs (ng/mL)   PFDA 0.24 [0.16, 0.42]
    PFHxS 0.70 [0.43, 1.27]
    PFNA 0.75 [0.54, 1.22]
    PFOA 2.20 [1.30, 3.07]
    PFOS 4.74 [3.20, 7.65]
    PFUnDA 0.16 [0.09, 0.32]
    Σ PFASs 9.33 [6.39, 14.09]
  1. All POP concentrations were based upon machine-measured concentrations without substitution of concentrations < LOQ. OCPs, PCBs, and PBDEs concentrations are adjusted for total plasma lipids. Missing data have been imputed
  2. POP persistent organic pollutant