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Geographical distribution of CSF-OCB positivity.
| Geographical regions | Overall, n | CSF-OCB, n (%) | p value | |
|---|---|---|---|---|
| Negative | Positive | |||
| Latitude | ||||
| Low (20° – 30°N) | 119 | 38 (31.9) | 81 (68.1) | 0.016 |
| Medium (31° – 40°N) | 282 | 65 (23.0) | 217 (77.0) | |
| High (41° – 50°N) | 82 | 11 (13.4) | 71 (86.6) | |
| Altitude | ||||
| Low (< 500 m) | 316 | 85 (26.9) | 231(73.1) | 0.025 |
| High (> 1000 m) | 167 | 29 (17.4) | 138 (82.6) | |
