Table 1. Characteristics of included studies.
| Author, year (ref n.) | Country | Ethnicity | Case | Control | HWE | NOS | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| GG | GA | AA | GG | GA | AA | |||||
| Altmann, 2016 (11) | Brazil | Caucasian | 56 | 33 | 5 | 61 | 18 | 2 | 0.632 | 6 |
| Bialecka, 2014 (10) | Poland | Caucasian | 143 | 47 | 5 | 33 | 15 | 1 | 0.636 | 6 |
| Wang, 2014 (12) | China | Asian | 54 | 81 | 39 | 22 | 49 | 18 | 0.330 | 7 |
| Karakasis, 2011 (13) | Greece | Caucasian | 10 | 7 | 1 | 105 | 55 | 6 | 0.714 | 5 |
| Gao, 2010 (14) | Spain | Caucasian | 14 | 6 | 2 | 85 | 63 | 4 | 0.052 | 6 |
| Guerini, 2009 (9) | Italy | Caucasian | 12 | 10 | 7 | 145 | 106 | 14 | 0.339 | 7 |
HWE: Hardy-Weinberg equilibrium; NOS: Newcastle-Ottawa Scale.