Treatment of high-grade dysplasia and intramucosal carcinoma using radiofrequency ablation or endoscopic mucosal resection + radiofrequency ablation: Meta-analysis and systematic review

Table 2 Newcastle-Ottawa Scale for evaluating the quality of the studies

Ref.	Selection				Comparability	Outcome			Points
	Representativeness of the exposed cohort	Selection of the unexposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at the start of study	Comparability of cohorts on the basis of the design or analysis	Assessment of outcome	Was follow-up long enough for outcomes to occur	Adequacy of follow-up of cohort
Li et al[10], 2015	×	×	×	×	×	×	×		7 Points
Strauss et al[11], 2014	×	×	×	×	×	×	×	×	8 Points
Haidry et al[12], 2013	×	×	×	×	×	×		×	7 Points
Kim et al[14], 2012	×	×	×	×	×	×			6 Points
Caillol et al[15], 2012	×	×	×	×		×		×	6 Points
Okoro et al[16], 2012	×	×	×	×	×	×		×	7 Points
Pouw et al[17], 2008	×	×	×	×	××	×		×	8 Points