Associations
Of the 2,719 SNPs reported to be significantly associated with intelligence, 2,047 (75.3%) were reported only once. Thus, less than a quarter of included SNP-intelligence associations in the included studies were replicated in a separate study. In total, only 30 SNPs (1.1% of the total) were replicated in five different studies, and none were replicated in more than that. The number and percentage of SNPs reported a given number of times in the included studies (ranging from 1 to 5) is shown in Table 2.
# of times reported Number of SNPs Percent
1 2047 75.3%
2 438 16.1%
3 144 5.3%
4 60 2.2%
5 30 1.1%
Total 2719