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Smarter children may enjoy longer lives

The study, shows elderly adults deemed gifted by childhood IQ tests, found that the higher their early IQs were, the longer they lived.

india Updated: Nov 14, 2005 13:39 IST
Reuters
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Smarter children may enjoy longer lives, the results of a new study suggest. The study, which followed elderly adults deemed gifted by childhood IQ tests, found that the higher their early IQs were, the longer they lived. The survival advantage began to plateau after a childhood IQ of 163, an intelligence level few people reach. Dr. Laurie T. Martin and Laura D. Kubzansky of the Harvard School of Public Health report these findings in the American Journal of Epidemiology.

Though the reasons for the link between IQ and longevity are not clear, it does not appear to be merely a reflection of income and social position. As children, the participants were from affluent families and most were white. Yet childhood IQ was still a factor in their lifespan. Similarly, in an earlier study of Americans with more varied childhood IQs , family incomes and backgrounds, Martin found that IQ was related to health problems independent of their socio-economic levels. This, she explained, suggests that IQ not only affects longevity among the well off, but among the people in the lower income groups as well.

As research has already linked IQ to mortality, the current study, according to Martin, was in part an attempt to see how far the IQ-health advantage extends. The researchers expected there to be a cut-off at which a high IQ no longer brought any extra health benefits. And there was. But, Martin said, they were surprised at how high that cut-off turned out to be. IQs of 163 or higher are not often seen; the average IQ score in the general population is 100 (by definition), and children who score above 130 are considered "gifted." The current study is based on data from 862 men and women followed since childhood, starting in 1922, until 1986. All had childhood IQs of 135 or higher, with the average being 151. The researchers found that, up to the cut-off point of 163, participants' risk of dying decreased as their IQ increased.

It's not yet clear why childhood IQ itself might affect a person's lifetime health. Martin and Kubzansky in trying to solve this puzzle, point to several possibilities. For one, these children may be more likely to take up healthy habits like regular exercise, eating nutritious food and sleeping well, while shunning health risks like smoking. They are also more likely to get high paying, prominent jobs as adults, with all the advantages that confers. Understanding exactly why IQ affects longevity, according to Martin, could ultimately help improve health and healthcare for everyone.