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The association between month of birth and academic achievement assessed at age 16 in our sample of 930,182 Swedish adolescents. A linear model predicted that being 1 month younger reduced academic achievement in this sample by an average of 2.25% of an SD. As detailed in the Method section, these results included a statistical correction for the 3% of the sample who were assessed at ages 15 or 17. The y axis depicts SD units.
