Fig. 4.

Associations of POPs exposure with infertility using logistic regression. Dot shows odds ratio (OR) with 95% confidence interval (CI) error bars of chemicals as continuous (log) and quartiles (Q1 as reference). OR > 1 denotes higher odds for infertility while OR < 1 denotes lower odds for infertility. OR indicated with * for p value < 0.05. P trend shown for significant linear trend of OR. Abbreviations: COC – combined oral contraceptives; HCB - hexachlorobenzene; p,p´-DDE – dichlorodiphenyldichloroethylene; PCB – polychlorinated biphenyls; Q1 – first quartile, Q2 – second quartile, Q3 – third quartile, Q4 – fourth quartile