Table 1.
Main characteristics of the studies included in this meta-analysis.
| Study | Year | Country | Sample size (case/control) | Genotype frequency (case/control) | Genotyping method | Quality score (★) | ||
|---|---|---|---|---|---|---|---|---|
| GG | GT | TT | ||||||
| Cipollini | 2013 | Italy | 1200/1196 | 292/307 | 630/599 | 278/290 | TaqMan | 7 |
| Wokolorczyk | 2008 | Poland | 485/1910 | 122/420 | 254/977 | 109/513 | PCR-RFLP | 9 |
| Akdi | 2011 | Spanish | 389/463 | 114/142 | 187/204 | 88/117 | iPLFX | 9 |
| Jones | 2012 | UK | 751/6115 | 241/1662 | 346/3012 | 164/1441 | KAspar; SNP array | 8 |
PCR-RFLP – polymerase chain reaction-restriction fragment length polymorphism assay.