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Table 1 Characteristics of excluded studies
| Author; date | Country | Type of study | Exclusion criteria |
|---|---|---|---|
| Abbastabar et al., (2015) [34]. | Iran | Ecological study | Risk not specified. |
| Khoury et al., (2014) [39]. | Lebanon | Experimental study. | Experimental Research in vitro using cell line and cell culture. |
| Rohani et al., (2013) [35]. | Iran | Ecological study | Risk not specified. |
| Habib et al., (2013) [38]. | United Arab Emirates | Experimental study. | Experimental research in vitro using culture of cell. |
| Attaallah et al., (2012) [36]. | Turkey | Experimental study. | Experimental Research in vivo using rats. |
| Bener et al., (2010) [41]. | Qatar | Case control study | Not examine the relationship between dairy products and CRC. |
| Almurshed et al., (2009) [40]. | Saudi Arabia | Case control study | Not examine the relationship between dairy products and CRC. |
| Can et al., (2009) [42]. | Turkey | Clinical trial | Study the quality of life in patients being treated for CRC. |
| Topuz et al., (2008) [43]. | Turkey | Randomized prospective observational study | Examine the effect of oral kefir administration on serum pro-inflammatory cytokine levels in patients with CRC. |
| Cenesiz et al., (2008) [37]. | Turkey | Experimental study. | Experimental research in vivo using mice. |
