Table 1.
Characteristics of included studies
| Author | Year | Country | Ethnicity | Cases | Controls | HWE | HLA-B27 status |
|---|---|---|---|---|---|---|---|
| Bang | 2010 | Korea | Asian | 1164 | 752 | Yes | NA |
| Reveille 1 | 2010 | Mixed | Caucasian | 2053 | 5140 | Yes | NA |
| Reveille 2 | 2010 | Mixed | Caucasian | 898 | 1518 | Yes | NA |
| Evans 1 | 2011 | Mixed | Caucasian | 1787 | 4800 | Yes | Reported |
| Evans 2 | 2011 | Mixed | Caucasian | 3023 | 8779 | Yes | Reported |
| Evans 3 | 2011 | Mixed | Caucasian | 2111 | 4483 | Yes | Reported |
| Chen | 2012 | China | Asian | 200 | 200 | Yes | NA |
| Guo | 2012 | China | Asian | 309 | 384 | Yes | NA |
| Karaderi | 2014 | UK | Caucasian | 2978 | 8365 | Yes | Reported |
HWE, Hardy-Weinberg equilibrium.