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 |