Table 2. The characteristics of included studies in meta-analysis.
| First author | Year | Country | Ethnicity | Study design | Study type | Genotyping method | Sample size |
|---|---|---|---|---|---|---|---|
| Onouchi | 2012 | Japan | Asian | CC | GWAS | Illumina Human Hap550v3 BeadChip | 428/3379 |
| Onouchi | 2012 | Japan | Asian | CC | Replication | Invader Assay | 470/378 |
| Onouchi | 2012 | Japan | Asian | CC | Replication | Invader Assay | 284/569 |
| Onouchi | 2012 | USA | European | TDT | Replication | Invader Assay | 248 |
| Onouchi | 2012 | USA | Asian | TDT | Replication | Invader Assay | 72 |
| Onouchi | 2012 | USA | Hispanic | TDT | Replication | Invader Assay | 94 |
| Onouchi | 2012 | USA | Mixed | TDT | Replication | Invader Assay | 89 |
| Yan | 2013 | China | Asian | CC | Replication | TaqMan SNP Genotyping Assays | 358/815 |
| Current study | 2013 | China | Asian | CC | Replication | TaqMan SNP Genotyping Assays | 418/474 |
Abbreviations: CC, case-control study; TDT, transmission/disequilibrium test.