A meta-analysis of the black-white IQ gap

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This meta-analysis aims to determine the magnitude of the black-white gap in mean IQ in the United States. It was conducted in accordance with a previously published protocol (Neyeloff et al. 2012). A total of 23 studies-deriving from 10 previously published reports-were included in the meta-analysis. High heterogeneity was found (I2 = 99.7%), so a random-effects meta-analysis was conducted, which resulted in a much lower value of I2 (namely, 35.0%) and an effect size of 0.853 SD (95% CI 0.747, 0.959). This effect size is equivalent to a black-white gap in mean IQ scores of 12.8 points.

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