title: Mid-life attainment of the mentally retarded: a longitudinal study.
mesh_terms: D000124:Achievement; D000223:Adaptation, Psychological; D000368:Aged; D004812:Epidemiologic Methods; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D008875:Middle Aged; D012649:Self Concept; D012924:Social Conditions