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Table 2 Quality assessment of published papers on dairy products and CRC risk in the Middle East and North African countries

From: Dairy products and colorectal cancer in middle eastern and north African countries: a systematic review

Author/Reference Relevant to this SR Aims clearly stated Appropriate study method Sample representative of target population Confounding and bias considered Good Responsse rate? Were questions piloted / validated? Tables/figures understandable Can results be applied to local situation? Accepted as Type IV evidence?
Tayyem et al., (2016) [50]. Yes Yes Yes Yes Yes Yes Yes Yes Yes No, type (III)
Suhad et al., (2015) [47]. Yes Yes Yes Yes Yes Yes Yes Yes Yes No, type (III)
Mahfouz et al., (2014) [51]. Yes Yes Yes No No Yes No Yes No No, type (III)
Arafa et al., (2011) [46]. Yes Yes Yes No No Yes No Yes No No, type (III)
Guesmi et al., (2010) [48]. Yes Yes No No No Yes No Yes No No, type (III)
Nashar et al., (2008) [49]. Yes Yes Yes No No Yes No Yes No No, type (III)
Rozen et al., (2001) [52]. Yes Yes Yes No Yes No Yes Yes No No, type (II)