Table 2. Prevalence of the A allele of the TNF-α gene-308 A/G polymorphism.
| Population | Number of studies | Numbers | A allele(%) | ||
| Case | Control | Case | Control | ||
| European | 7 | 506 | 853 | 28.7 | 14.4 |
| Asian | 1 | 49 | 152 | 19.4 | 9.5 |
| Overall | 8 | 555 | 1005 | 48.1 | 23.9 |
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