The study sought to determine whether 100 emotionally disturbed, mentally retarded Ss assigned four distinct diagnostic labels could be differentiated from each other on the basis of sex, age, degree of mental impairment, and adaptive behavior. (Author)

This study of 28 girls (ages 2-19) with Rett Syndrome found profound handicaps in the intellectual and adaptive areas, according to standardized tests. Subjects seemed capable of learning some self-help skills at a basic level. The Cattell Mental Age was significantly negatively correlated with chronological age. (JDD)