...the 2- to 4-year-olds who were spanked scored 5 points lower on the IQ test than those not spanked. For children ages 5 to 9, the spanked ones scored on average 2.8 points lower than their unspanked counterparts.
The results, he said, were statistically significant. And they held even after accounting for parental education, income, cognitive stimulation by parents and other factors that could affect children's mental abilities.
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