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Table 3 Weighted quantile sum index stratified according to age and use of combined oral contraceptives (COCs). Data presented are estimate (SE) and OR (95% CI)

From: Persistent organic pollutants, pre-pregnancy use of combined oral contraceptives, age, and time-to-pregnancy in the SELMA cohort

Group Outcome: TTPa
Estimate (SE)b
Chemicals of concernc Outcome: Infertility
OR (95% CI) b
Chemicals of concernc
<  29 years old Non-COC user −0.02(0.05) 0.97 (0.22–4.26)
COC user 0.03 (0.03) 0.92 (0.35–2.41)
≥ 29 years old Non-COC user 0.09 (0.03)* PCB 183, 156, 187, 118 1.79 (1.03–3.11)* PCB 187, 156, 74, 183, transnonachlor
COC user 0.07 (0.04) 1.27 (0.07–2.3)
  1. alog transformed + 1
  2. bAdjusted with parity, regularity of menses, maternal BMI, and smoking
  3. cChemicals with weight greater than 7.6%
  4. * p < 0.05
  5. Abbreviations: CI confidence interval, COCs combined oral contraceptives, PCB polychlorobiphenyl, OR odds ratio, SE standard error, TTP time-to-pregnancy