1 From the Department of Psychiatry and Human Behavior, Brown University, Providence, Rhode Island, Department of Psychology, George Mason University, Fairfax, Virginia, Department of Psychology, University of Rochester, Rochester, New York, and Division of Maternal and Child Health, Department of Health and Human Services, Rockville, Maryland
Verbal IQ scores in a socially heterogeneous sample of 215 4-year-old children were highly related to a cumulative environmental risk index composed of maternal, family and cultural variables. Different combinations of equal numbers of risk factors produced similar effects on IQ, providing evidence (1) that no single factor identified here uniquely enhances or limits early intellectual achievement and (2) that cumulative effects from multiple risk factors increase the probability that development will be compromised. The multiple risk index predicted substantially more variance in the outcome measure than did any single risk factor alone, including socioeconomic status. High-risk children were more than 24 times as likely to have IQs below 85 than low-risk children.
Key Words: preschool IQ social-environmental risk
Submitted on January 30, 1986
Accepted on May 20, 1986
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