Skip to main content

Table 4 Summary of findings on the quality of evidence

From: Effectiveness of control measures to prevent occupational tuberculosis infection in health care workers: a systematic review

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)
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.
  1. aIf more than one before or after period, higher or highest number used for each phase. Does not include controls