PROTOCOL OUTLINE: Participants are evaluated for cognitive and social function at entry and 4 years following entry. Assessments include the Wechsler Intelligence Scale for Children-Revised, a child behavior checklist, the Children's Self-Concept Scale, and visual-spatial, visual-motor, attention, memory, language, and facial recognition tasks.
Patients (and parents) undergo X-chromosome analysis; brain magnetic imaging is optional.
Controls are matched using school selection and telephone interviews.
A study duration of 12 years is estimated.
