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

BMC Cancer

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

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)

ISSN: 1471-2407