Table I.
Characteristics of studies included in the meta-analysis.
| First author/(ref) | Year | Country | Ethnicity | Genotyping method | Cases | Controls | Genes |
|---|---|---|---|---|---|---|---|
| Ou (15) | 2010 | China | Asian | PCR/LDR | 196 | 246 | rs2294008 and rs2976392 |
| Song (16) | 2011 | Korea | Asian | PCR-RFLP | 3245 | 1700 | rs2294008 |
| Lochhead a (12) | 2011 | Poland | Caucasian | PCR | 312 | 383 | rs2294008 |
| Lochhead b (12) | 2011 | USA | Caucasian | PCR | 309 | 211 | rs2294008 |
| Sakamoto a (11) | 2008 | Japan | Asian | PCR | 1531 | 1398 | rs2294008 and rs2976392 |
| Sakamoto b (11) | 2008 | Korea | Asian | PCR | 875 | 390 | rs2294008 and rs2976392 |
| Lu (13) | 2010 | China | Asian | PCR-RFLP | 1053 | 1100 | rs2294008 and rs2976392 |
| Zeng (20) | 2011 | China | Asian | PCR-RFLP | 460 | 549 | rs2294008 |
| Wu (17) | 2009 | China | Asian | PCR-RFLP | 1736 | 1020 | rs2294008 and rs2976392 |
| Matsuo (18) | 2009 | Japan | Asian | PCR | 708 | 708 | rs2294008 and rs2976392 |
| Sala (19) | 2011 | 10 European countries | Caucasian | PCR | 411 | 1530 | rs2294008 |
| Wang (21) | 2010 | China | Asian | PCR | 943 | no | rs2294008 |
PCR, polymerase chain reaction; LDR, ligase detection reaction; RFLP, restriction fragment length polymorphism.