Study	Reason for exclusion
Afessa 2010	Retrospective cohort analysis
Berra 2008	Randomized controlled trial comparing participants intubated and mechanically ventilated for 12 to 24 hours with silver sulfadiazine NASCENT versus non‐coated ETT. Excluded due to absence of participants who were intubated for 24 hours or longer
Morrow 2009	Prospective non‐randomized study
Morrow 2010	Retrospective study
Shorr 2009	A simple decision model with a hypothetical 1000‐patient cohort cost‐effectiveness analysis based on the NASCENT trial. Excluded due to the study design (hypothetical 1000‐patient cohort)

ETT = endotracheal tube

NASCENT = North American Silver‐Coated Endotracheal Tube.