Table 2.
The prevalence of sacroiliitis in the three institutions (N = number of patients).
| Institution | Total N | N | % |
|---|---|---|---|
| Belgium | 180 | 40 | 22 |
| Canada | 180 | 29 | 16 |
| Poland | 180 | 37 | 20 |
| Total sacroiliitis | 540 | 106 | 20 |
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