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Table 2  Newcastle–Ottawa scale for the assessment of the quality of studies included

From: Metabolic syndrome and esophageal cancer risk: a systematic review and meta‑analysis

Cohort study Author (year) Selection Comparability Outcome Total
1 Duggan (2013) [25] *** * ** 6
2 Ko (2016) [26] **** * *** 8
3 Lin (2015) [27] **** * ** 7
4 Lindkvist (2014) [15] **** * *** 8
Case–control study Author (year) Selection Comparability Exposure Total
1 Drahos (2016) [14] **** * ** 7
2 Drahos (2017) [24] **** * ** 7