| Author (Year) | Country (Ethnicity) | N (Healthy Control, SSc) | % GG Frequency | p Value | |
|---|---|---|---|---|---|
| Healthy Control | SSc | ||||
| Fonseca (2007) | United Kingdom (Caucasian) | 1,000 (500, 500) | 19.2 | 30.4 | < 0.001 |
| Gourh (2008) | North America (Caucasian, African-American, Hispanic-American) | 1,662 (668, 994) | 29.8 | 29.0 | 0.83 |
| Kawaguchi (2009) | Japan (Japanese) | 664 (269, 395) | 22 | 32 | 0.002 |
| Rueda (2009) | European ancestry (Multi-national) | 4,211 (98-317, 98-369) | 24.4-29.9 | 26.6-33.7 | 0.11-0.75 |
| Granel (2010) | France (Caucasian) | 510 (269, 241) | 30.9 | 22.8 | 0.61 |
| Present study | Thailand (Thai) | 149 (99, 50) | 44.0 | 39.4 | 0.60 |