Table 1.
Characteristics of studies included in the meta‐analysis
| Author | Year | Country | Ethnicity | Age (year) | Male (%) | Sample size | Genotype method | Polymorphism | Newcastle–Ottawa scale score | |
|---|---|---|---|---|---|---|---|---|---|---|
| Case | Control | |||||||||
| Rueda et al. | 2005 | Spain | European | 74.5 ± 6.0 | 42.7 | 53 | 226 | TaqMan | −1154G/A | 7 |
| Liu et al. | 2007 | China | Asian | 67.0 ± 9.8 | 58.7 | 155 | 195 | PCR‐RFLP | +936C/T | 9 |
| Zhang et al. | 2007 | China | Asian | 60.3 ± 9.4 | 62.7 | 1849 | 1798 | PCR‐RFLP | −1154G/A | 9 |
| Li et al. | 2007 | China | Asian | 62.0 ± 10.3 | 53.5 | 200 | 100 | PCR‐RFLP | +936C/T | 9 |
| Li et al. | 2009 | China | Asian | 66.2 ± 5.0 | 48.0 | 150 | 120 | PCR‐RFLP | +936C/T | 7 |
| Kim et al. | 2011 | South Korea | Asian | 63.5 ± 11.4 | 56.6 | 991 | 494 | PCR | +936C/T,−1154G/A | 9 |
| Fu et al. | 2011 | China | Asian | 64.8 ± 9.6 | 57.1 | 147 | 131 | PCR‐RFLP | +936C/T,−1154G/A | 8 |
| Yu et al. | 2012 | China | Asian | 65.4 ± 8.2 | 67.7 | 420 | 456 | PCR‐RFLP | +936C/T | 7 |
| Fontanella et al. | 2013 | Italy | European | 55.3 ± 12.0 | 34.5 | 200 | 200 | PCR | +936C/T | 8 |
| Zhang et al. | 2014 | China | Asian | 57.6 ± 10.1 | 51.2 | 68 | 118 | PCR‐RFLP | +936C/T | 6 |