|Weighted event rates|
|Outcomes||Number of trials (n)||SSD||No SSD||RRR (95% CI)||NNT (CI)|
|*Abbreviations defined in glossary. Weighted event rates, RRR, RRI, NNT, NNH, and CI calculated from data in article using a fixed effects model. Follow up was to discharge or death.|
|Ventilator associated pneumonia||5 (896)||12%||19%||49% (29 to 63)||14 (9 to 31)|
|Mortality||4 (823)||16.5%||16.3%||7% (−19 to 42)||Not significant|
Review: subglottic secretion drainage reduces ventilator associated pneumonia
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