Paternal exposure to medical-related radiation associated with low birthweight infants: A large population-based, retrospective cohort study in rural China.

Low birthweight (LBW) is closely associated with fetal and perinatal mortality and morbidity. We identified the risk factors of LBW and geographical differences in LBW incidence in 30 Chinese provinces in the present study.This study was a population-based, retrospective cohort study performed in 30 Chinese provinces.