Abstract
Examination of fetal wastage data for a large collection of CL [cleft lips] .+-. P [palate] and CP [cleft palate] sibships previously reported does not indicate the frequency of recognized abortion to be higher in the sibships of CL + P vs. CL index cases, female vs. male CL .+-. P index cases, bilateral vs. unilateral CL .+-. P index cases, female bilateral CL .+-. P index cases vs. male unilateral CL .+-. P index cases, or male vs. female CP index cases. These observations fail to confirm those reported by Dronamraju, and provide no evidence of a positive relation between degree of liability to facial cleft malformation and fetal mortality.