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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Mean number of days of impaired activities | 6 | 767 | Mean Difference (IV, Fixed, 95% CI) | ‐0.49 [‐0.94, ‐0.04] |
| 1.1 Acute bronchitis studies | 5 | 393 | Mean Difference (IV, Fixed, 95% CI) | ‐0.48 [‐0.96, 0.01] |
| 1.2 Subgroup with no placebo control | 1 | 374 | Mean Difference (IV, Fixed, 95% CI) | ‐0.57 [‐1.75, 0.61] |
