Optimizing Livers for Transplantation Using Machine Perfusion versus Cold Storage in Large Animal Studies and Human Studies: A Systematic Review and Meta-Analysis

Table 3

Quality for cohort studies included in the human meta-analysis using the Newcastle-Ottawa Quality Assessment Scale.

Studies	Selection				Comparability	Assessment of Outcome			Scores
Author( year)	Representativeness of exposed cohort	Selection of Non- exposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Comparability of cohorts in design and analysis	Assessment of outcome	Was follow-up long enough for outcomes to occur?	Adequacy of follow up
Guarrera; (2010)	☆		☆	☆		☆	☆	☆	6
Guarrera; (2014)	☆		☆	☆		☆	☆	☆	6
Dutkowski; (2015)	☆	☆	☆	☆		☆	☆	☆	7
Ravikumar; (2016)	☆	☆	☆	☆		☆	☆	☆	7
Selzner; (2016)	☆		☆	☆		☆	☆	☆	6
Bral; (2017)	☆	☆	☆	☆		☆	☆	☆	7
van Rijn; (2017)	☆	☆	☆	☆		☆	☆	☆	7
Nasralla; (2018)	☆	☆	☆	☆	☆	☆	☆	☆	8