Association between ischemic heart disease and colorectal neoplasm: a systematic review and meta-analysis

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Table 2 Methodological quality of included studies measured by Newcastle–Ottawa Scale

Study	Selection	Comparability	Exposure or outcome	Total
Neugut et al. (1998)	☆☆☆☆	☆☆	☆	7
Chan et al. (2006)	☆☆☆☆	☆	☆☆	7
Chan et al. (2007)	☆☆☆	☆	☆☆	6
Yang et al. (2010)	☆☆☆	☆☆	☆☆☆	8