Mendelian randomization suggests that head circumference, but not birth weight and length, associates with intelligence.

Abstract excerpt

INTRODUCTION: Birth parameters have long been reported to have a role in human intelligence. However, the causalities reported in previous observational studies were controversial. Our study aims to provide an unbiased investigation of the causal associations between birth parameters and human intelligence using the Mendelian randomization (MR) approach. METHODS: Genetic instrumental variables for MR analyses...

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