Table 1.
Main characteristics of selected studies
| Author | Year | Ethnicity | CRC location | Cases | Controls | Source of controls |
|---|---|---|---|---|---|---|
| Landi | 2003 | Caucasian | Rectal, colon | 377 | 326 | Population-based |
| Gong | 2005 | Caucasian | Rectal, colon | 163 | 212 | Hospital-based |
| Jiang | 2005 | Asian | Rectal, colon | 301 | 291 | Hospital-based |
| McGreavey | 2005 | Caucasian | NR | 484 | 738 | Hospital-based |
| Murtaugh | 2005 | Caucasian | Rectal, colon | 2371 | 2972 | Population-based |
| Siezen | 2005 | Caucasian | NR | 384 | 403 | Population-based |
| Gunter | 2006 | Caucasian | NR | 244 | 231 | Hospital-based |
| Koh | 2006 | Asian | Rectal, colon | 362 | 1164 | Population-based |
| Kuriki | 2006 | Asian | NR | 128 | 238 | Hospital-based |
| Theodoropoulos | 2006 | Caucasian | NR | 222 | 200 | Hospital-based |
| Vogel | 2007 | Caucasian | NR | 355 | 753 | Population-based |
| Küry | 2008 | Caucasian | NR | 1023 | 1121 | Population-based |
| Slattery | 2009 | Caucasian | NR | 1839 | 2014 | Population-based |
| Hawken | 2010 | Caucasian | NR | 1257 | 1336 | Population-based |
| Abulí | 2011 | Caucasian | NR | 515 | 515 | Hospital-based |
| Crous-Bou | 2012 | Caucasian | NR | 812 | 1479 | Hospital-based |
| Sainz | 2012 | Caucasian | NR | 1798 | 1810 | Population-based |