Table 4 Summary of findings on the quality of evidence
Population: Health care workers Settings: USA [eight studies], Brazil [one study] and Thailand [one study] Intervention: Administrative, environmental and personal preventative measures Comparison: Non-use, less frequent or less intense use of TB transmission control measures | |||
Outcomes | Impacts | No of Participants (studies) | Quality of the evidence GRADE) |
Tuberculin Skin Test (TST) conversion | All studies showed a decrease in TST conversion | 7 839a before intervention; 9 084a after intervention (10 studies) | āāāāāā Low |
* We downgraded the quality of evidence because of the uncontrolled (observational) study design and unclear/high risk of bias in most of the included studies. GRADE Working Group grades of evidence: High quality: Further research is very unlikely to change our confidence in the estimate of effect. Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. Very low quality: We are very uncertain about the estimate. | |||