Our primary analysis extends the (combined discovery and replication) sample of a previous genome-wide association study (GWAS) of educational attainment10 from N = 405,072 to N = 1,131,881 individuals. We performed a sample-size-weighted meta-analysis of 71 quality-controlled cohort-level results files using the METAL software35. The meta-analysis combines 59 cohort-level results files from the previous study with 12 new results files: 8 from cohorts that were not included in the previous study10 and 4 from cohorts that updated their results in larger samples.
