According to research on Romanian orphanages, children who were adopted after 18 months tended to score ____ points lower on intelligence tests than the statistical norm.

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Research on Romanian orphanages has shown that children who were adopted after 18 months of age tended to score 15 points lower on intelligence tests than the statistical norm. This is likely due to the lack of stimulation and sensory experiences in the orphanages, leading to delayed cognitive development.

According to Research on Romanian Orphanages, Children Who Were Adopted