Cochrane · systematic review · CD012219
Humidification of indoor air for preventing or reducing dryness symptoms or upper respiratory infections in educational settings and at the workplace
Byber, K, Radtke, T, Norbäck, D, et al. · Cochrane Database of Systematic Reviews · 2021 · Cochrane Library
WorkAMSTAR 2: not assessed
SoF tableOnly the outcomes this review put in its Summary of Findings table are listed (the Cochrane Handbook caps them at about seven per comparison). Its other analyses are not shown here.
Questions
17
current version
GRADE rated
16
No studies
1
Included studies
NR
No studies 1 · 5.9%Ungraded 0 · 0%Very low 9 · 52.9%Low 7 · 41.2%Moderate 0 · 0%High 0 · 0%
Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.
Questions and results
Summary of findings table 'dryness symptoms'
Population: Adults
| Outcome | Effect | Evidence | Status / GRADE |
|---|---|---|---|
Dry eye Cross‐over study (cluster‐RCT) after 6 weeks | OR 0.54 [0.37, 0.79] | 211 participants | Low Downgraded: risk of bias |
Dry eye Cross‐over studies (cluster non‐RCT) after 6 – 12 weeks | OR 0.58 [0.27, 1.25] | 407 participants | Low Downgraded: risk of bias, imprecision |
Dry eye Before‐and‐after studies after 6 weeks ‐ 4 months | OR 0.57 [0.23, 1.41] | 102 participants | Very low Downgraded: risk of bias, imprecision |
 | no estimate extracted | NR | No studies |
Dry skin Cross‐over studies (cluster non‐RCT) after 6 ‐ 12 weeks | OR 0.66 [0.33, 1.32] | 407 participants | Low Downgraded: risk of bias, imprecision |
Dry skin Before‐and‐after Studies after 12 weeks to 4 months | OR 0.69 [0.33, 1.47] | 121 participants | Very low Downgraded: risk of bias |
Dry nose (dry upper respiratory tract) Cross‐over study (cluster non‐RCT) after 6 weeks | OR 0.87 [0.53, 1.42] | 368 participants | Low Downgraded: risk of bias, imprecision |
Dry nose (dry upper respiratory tract) Cross‐over study (cluster‐RCT) after 6 weeks | OR 1.08 [0.73, 1.6] | 1 study · 211 participants | Low Downgraded: risk of bias |
Summary of findings table 'adverse effects'
Population: Adults
| Outcome | Effect | Evidence | Status / GRADE |
|---|---|---|---|
Perception of stuffiness: Cross‐over study (cluster‐RCT) after 6 weeks | OR 2.18 [1.47, 3.23] | 211 participants | Low Downgraded: risk of bias |
Perception of stuffiness: Cross‐over study (cluster non‐RCT) after 6 weeks | OR 1.7 [1.1, 2.61] | 368 participants | Low Downgraded: risk of bias, imprecision |
Perception of stuffiness: 2 Before‐and‐after studies after 1‐4 months | no estimate extracted | 102 participants | Very low Downgraded: risk of bias, imprecision |
Summary of findings 'absenteeism'
Population: Children
| Outcome | Effect | Evidence | Status / GRADE |
|---|---|---|---|
Absenteeism due to cold symptoms | OR 0.54 [0.45, 0.65] | 1 study · 232 participants | Very low Downgraded: risk of bias |
Average days of absence per child | no estimate extracted | 1 study · 162 participants | Very low Downgraded: risk of bias |
Average weekly absence | OR 0.38 [0.15, 0.96] | 1 study · 263 participants | Very low Downgraded: risk of bias |
Average total absenteeism | no estimate extracted | 12 participants | Very low Downgraded: risk of bias |
Absenteeism due to sickness | no estimate extracted | 1 study · 116 participants | Very low Downgraded: risk of bias |
Absenteeism due to influenza‐like illness | no estimate extracted | 1 study · 116 participants | Very low Downgraded: risk of bias |