Associations between 1976 TCDD exposure and infertility based on unweighted and weighted genetic risk allele score category, Seveso Women’s Health Study (n = 442), Seveso, Italy, 1976–2016. Models adjusted for maternal age at trying, smoking in previous year, oral contraceptive use in previous year, pre-explosion parity, irregular menstrual cycle, history of reproductive or endocrine conditions and paternal age.