| Absenteeism due to sickness: Controlled Study non‐RCT | ||||
| Study | Non‐humidification ‐ % out | Non ‐ humidification ‐ Total attendance | Humidification % out | Humidification ‐ Total attendance |
| Reiman 2018 | 1.29 | 1788 | 1.00 | 2293 |
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