[Association between maternal peri-conceptional exposures and risk of hypospadias and cryptorchidism in offspring].

To investigate the relationship between maternal exposures to peri-conceptional risk factors and the risk of hypospadias and cryptorchidism in offspring. Pregnant women who delivered male newborns and participated in the China birth cohort study between February 2018 and December 2020 at the research center of Beijing Obstetrics and Gynecology Hospital, Capital Medical University were selected for the study. All were enrolled at 6-13 weeks of their gestation. Baseline risk factor information was collected by questionnaire survey. Information on the outcome of hypospadias and cryptorchidism was obtained by clinical examination at birth and ultrasonography. Logistic regression was used to analyze the Odds Ratio () and 95% Confidence Interval (95%) of each factor with respect to the onset of the outcome. A total of 15, 833 pregnant women with an average age of (31.81±3.84) years were included. Among their offsprings, 113 were diagnosed as hypospadias or cryptorchidism (42 hypospadias, 69 cryptorchidism, and 2 both hypospadias and crypterchidism), with an incidence of 7.14‰. The results of multivariate logistic regression analysis showed that mothers with pregnancy history of birth defects (3.01, 95%: 1.09-8.35), with preconception Hepatitis B infection (=4.74, 95% 1.10-20.42), fetal growth restriction (=4.02, 95%: 2.10-7.68), multivitamin use since preconception (1.98, 95%: 1.12-3.52), and never cook and eat at home (=2.17, 95%: 1.23-3.82) were risk factors for hypospadias and cryptorchidism (all <0.05). Obesity in early pregnancy, preconception Hepatitis B infection, pregnancy history of birth defects, fetal growth restriction, multivitamin use before pregnancy, and rarely cook and eat at home were associated with an increased risk of hypospadias or cryptorchidism in their offsprings.