According to Pines (1981), longitudinal evidence shows that adults who grew up as only children average lower scores on many indices of social and mental health than those with siblings, as well as often having lower IQs.

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Pines (1981) does not provide evidence that only children have lower social and mental health indices or lower IQs compared to those with siblings. In fact, research on only children often shows they perform equally well or better on various psychological and achievement measures.

According to Pines (1981), Longitudinal Evidence Shows That Adults Who