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Table 1 Average bootstrap estimated weights for PCB congeners related to TTP after adjusting for race (African American vs all other) and whether the daughter was breastfed (yes or no)

From: A Cohort study evaluation of maternal PCB exposure related to time to pregnancy in daughters

Categories

PCB congener

Weights associated with longer TTPa

Weights associated with shorter TTPb

  

Bootstrap Means

Average Bootstrap Sum

Bootstrap Means

Average Bootstrap Sum

Group 1: Estrogenic

101

0.06

16%

0.10

17%

187 c

0.01

0.07

201

0.09

0

Group 2A: Anti-estrogenic (AE), dioxin like

66

0.07

22%

0.02

46%

74

0.01

0.11

105 d

<0.01

0.08

118

0

0.12

156 c

0.13

<0.01

167

0

0.12

Group 2B: AE & not dioxin like

138 d

0

<1%

0.06

14%

170

<0.01

0.07

Group 3: Phenobarb, CYP1A, CYP2B inducers

99 c

0.02

9%

<0.01

23%

153

0

0.09

180

<0.01

0.04

203

<0.01

0.07

183 d

0.07

0.02

Not categorized

56

0.47

54%

<0.01

0

146

0.07

0

  1. alonger TTP is related to decrease in “hazard” of pregnancy.
  2. bshorter TTP is related to increase in “hazard” of pregnancy.
  3. ccongeners found by Cohn et al. [4] to be associated with longer TTP.
  4. dcongeners found by Cohn et al. [4] to be associated with shorter TTP.