Author | Year | Country | Participants | Stage | Reference | |||||||
Total | Cases (CRC):controls (no CRC) | 0 | 1 | 2 | 3 | 4 | Unknown | |||||
1 | Grützmann et al | 2008 | USA | 309 | 126:183 | 0 | 22 | 36 | 54 | 11 | 3 | 12 |
2 | Lofton-Day et al | 2008 | USA | 312 | 133:179 | 0 | 20 | 32 | 47 | 31 | 3 | 23 |
3 | deVos et al | 2009 | Germany | 245 | 90:155 | 0 | 19 | 40 | 27 | 4 | 0 | 24 |
4 | Tänzer et al | 2010 | Germany | 67 | 33:34 | 5 | 6 | 0 | 1 | 14 | 7 | 13 |
5 | Ahlquist et al | 2012 | USA | 79 | 30:49 | 0 | 7 | 7 | 8 | 8 | 0 | 25 |
6 | Tóth et al | 2012 | Hungary | 184 | 92:92 | 0 | 25 | 14 | 36 | 18 | 0 | 14 |
7 | Lee et al | 2013 | South Korea | 197 | 101:96 | 0 | 26 | 30 | 28 | 17 | 0 | 26 |
8 | Liu et al | 2013 | Singapore | 52 | 26:26 | 0 | 26 | 0 | 0 | 0 | 0 | 27 |
9 | Church et al | 2014 | USA | 1510 | 53:1457 | 0 | 22 | 14 | 12 | 5 | 0 | 15 |
10 | Johnson et al | 2014 | USA | 301 | 101:200 | 2 | 26 | 20 | 23 | 13 | 17 | 16 |
11 | Potter et al | 2014 | USA | 1544 | 44:1500 | 0 | 39 | 5 | 0 | 17 | ||
12 | Su et al | 2014 | China | 234 | 172:62 | 0 | Unclear | 0 | 28 | |||
13 | Tóth et al | 2014 | Hungary | 58 | 34:24 | 0 | 6 | 11 | 11 | 5 | 1 | 18 |
14 | Jin et al | 2014 | China | 226 | 135:91 | 0 | Unclear | 0 | 19 | |||
15 | Ørntoft et al | 2015 | Denmark | 278 | 128:150 | 0 | 35 | 35 | 30 | 28 | 0 | 20 |
16 | Wu et al | 2016 | China | 586 | 291:295 | 4 | 37 | 66 | 82 | 33 | 62 | 21 |
17 | Song et al | 2017 | China | 978 | 388:590 | 0 | 52 | 129 | 162 | 19 | 0 | 7 |
18 | Song et al | 2017 | China | 409 | 85:324 | 0 | 9 | 38 | 31 | 7 | 0 | 22 |
19 | Chen et al | 2017 | Taiwan | 60 | 51: 9 | 0 | 16 | 27 | 0 | 29 |
CRC, colorectal cancer.