[A matched case-control study on 87 cases of congenital malformations].

In order to investigate the risk factors of congenital malformations, a case-control study on congenital malformations with 87 matched pairs was carried out in hospitals of Yinchuan area. The results showed that the risk factors of the congenital malformations in this area were mainly nocuous mental stimulation during early pregnancy, hyperemesis gravidarum, parturient personality (high scores of psychoticism and neuroticism), degree to parturient education and exposure to other detrimental factors in early pregnancy, smoking habit of neonate's father, and so on.