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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Mean number of days of feeling ill | 5 | 809 | Mean Difference (IV, Fixed, 95% CI) | ‐0.64 [‐1.16, ‐0.13] |
| 1.1 Acute bronchitis studies | 4 | 435 | Mean Difference (IV, Fixed, 95% CI) | ‐0.58 [‐1.16, ‐0.00] |
| 1.2 Subgroup with no placebo control | 1 | 374 | Mean Difference (IV, Fixed, 95% CI) | ‐0.86 [‐1.97, 0.25] |
