Table 4. Prevalence of AS and HLA-B27 in Different Population Groups.
| Group | Year | Frequency of AS (%) | HLA-B27 Population Frequency (%) | Reference |
|---|---|---|---|---|
| Hungary | 1977 | 0.24 | 13 | 22 |
| Haida (Canada) | 1984 | 20 | 50 | 23 |
| Netherlands | 1984 | 0.24 | 8 | 11 |
| Norway | 1985 | 1.2-1.4 | 14 | 24 |
| Sami (Norway) | 1992 | 1.2 | 24 | 25 |
| Taiwan (three groups) | 1994 | 0.19-0.54 | 2.1-9.2 | 26 |
| Chukotka (Siberia) | 1994 | 1.1 | 34 | 27 |
| Eskimo (Alaska) | 1994 | 0.4 | 37-50 | 28 |
| Berlin (Germany) | 1998 | 0.55 | 9 | 29 |
| Japan | 2001 | 0.0065 | 0.5 | 30 |
| Greece | 2005 | 0.24 | 6 | 31 |
| Italy | 2007 | 0.37 | 5 | 32 |
| Turkey | 2008 | 0.49 | 6.8-8.0 | 33 |
| China | 2008 | 0.1-0.5 | 3.6-5.7 | 34 |
| Iceland | 2010 | 0.13 | 15 | 35 |
| Mexico | 2011 | 0.02 | 4.6 | 36 |
| United States | 2012 | 0.54 | 6.1 | 18 |