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Distribution and incidence of RA.
| Studied group | Incidence ratio |
|---|---|
| Females vs males | 2 : 1 to 3 : 1 |
| Caucasian from North America | 100 case per 100,000 |
| Rural and urban Africans | 20-90 case per 100,000 |
| Native Americans | 500 case per 100,000 |
| Asians | 20-45 case per 100,000 |
| Caucasian from Europe | 5-89 case per 100,000 |
| Latin America | 10-50 case per 100,000 |
| Middle East countries | 10-50 case per 100,000 |
