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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Change in noise levels at 2 months' follow‐up | 1 | Mean Difference (IV, Fixed, 95% CI) | Totals not selected | |
| 2 Change in noise levels at 4 months' follow‐up | 1 | Mean Difference (IV, Random, 95% CI) | Totals not selected |
