Descriptive Epidemiology of Nonsyndromic Cleft Lip with or without Cleft Palate in Shanghai, China, from 1980 to 1989

Abstract

The birth prevalence of CL+/- CP in this Asian population was similar to published Caucasian rates. The observed seasonal variation would be consistent with possible environmental factors. Significant associations with maternal age, pregnancy age, and birth order warrant additional study of pregnancy history in Asian CL+/- CP.