Contrary to popular belief, having more children born into a family does not necessarily result in lower-IQ children. In their study, the researchers looked at data from the National Longitudinal Survey of Youth (NLSY), which gave them the opportunity to look at a large random national sample of families that included children whose academic performance had been reviewed multiple times throughout their academic careers.
The NLSY originated in 1972 as a household probability sample of the nation's youth ages 14-22. For 22 years the sample followed 11,406 young people at yearly intervals. Starting in 1986, the children born to the original female respondents were surveyed every other year. The family structure measures and intelligence scores of these children provide the basic data used in this study.
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