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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 17.1 Cohort study ‐ rhinoconjunctivitis | 1 | Odds Ratio (IV, Fixed, 95% CI) | 0.64 [0.19, 2.11] | |
| 17.2 Cohort study ‐ hypersensitivity/allergy | 1 | Odds Ratio (IV, Fixed, 95% CI) | 0.63 [0.14, 2.77] | |
| 17.3 Case‐control ‐ hay fever | 2 | Odds Ratio (IV, Random, 95% CI) | 1.16 [0.92, 1.45] |
