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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 19.1 Case‐control | 2 | Odds Ratio (IV, Fixed, 95% CI) | Subtotals only | |
| 19.1.1 Multiple sclerosis | 1 | Odds Ratio (IV, Fixed, 95% CI) | 1.13 [0.62, 2.05] | |
| 19.1.2 Acute disseminated encephalomyelitis | 1 | Odds Ratio (IV, Fixed, 95% CI) | 1.03 [0.44, 2.42] |
