In this study,we sought to determine the association between environmental factors and nonsyndromic cleft of the lip and/or palate(NSCLP)to understand the etiology of the disease.A total of200 NSCLP cases and 327 controls were recruited at the Maternal and Child Health Hospital of Xuzhou City.We conducted face-to-face interviews with the In this study, we sought to determine the association between environmental factors and nonsyndromic cleft of the lip and / or palate (NSCLP) to understand the etiology of the disease. A total of 200 NSCLP cases and 327 controls were recruited at the Maternal and Child Health Hospital of Xuzhou City.We conducted face-to-face interviews with the