[Conditional logistic regression analysis of risk factors on congenital birth defects in Baotou].

Congenital defects are one of the common diseases in the newborns, and are important factors affecting the quality of the population. This survey was done to find risk factors related to congenital defects and to provide scientific basis for promoting birth quality. In this paper, a case-control study on 90 cases using 1:2 matching was carried out in Baotou area, and conditional logistic regression analysis showed that the following six major risk factors were associated with birth defects, i.e.: intake of certain drugs during pregnancy, exposure to radioactive rays, and contacting certain harmful chemical substances, common cold and fever during the period of pregnancy, smoking addiction of baby's father and the family history of certain defects of baby's parents.