Table of Contents

Contents: Introduction. Methods. Characteristics of the Mentally retarded Children. Prenatal and Obstetric Factors. The Neonatal Period. Infancy. The Preschool Period. The School-Age Period. Subgroups of the Mentally Retarded. Familial Patterns of Mental Retardation. Summary and Conclusions. Variables Associated with Retardation. Correlations Among Independent Variables. Prenatal Drug Exposure. Distributions and Univartiate Statistics for Discriminating Characteristics of the Mildly Retarded Subgroups.