Table 5.
Crohn’s disease location and behaviour
| Study | Country (Region) | Time period | Number of cases | Montreal classification |
Population groups, % |
|
| SA | Caucasian | |||||
| Location | ||||||
| Walker (2011)[35] | United Kingdom (NW London) | 2008-2010 | 309 | L1 | 16.0 | 24.7 |
| L2 | 46.8 | 34.8 | ||||
| L3 | 37.2 | 40.5 | ||||
| L4 | 0.0 | 0.0 | ||||
| Goodhand (2012)[36] | United Kingdom (East London) | 2010 | 141 | L1 | 33.0 | 32.0 |
| L2 | 24.0 | 43.0 | ||||
| L3 | 38.0 | 22.0 | ||||
| L4 | 18.0 | 13.0 | ||||
| Li (2013)[22] | United States (San Francisco) | 1994-2009 | 57 (Paed) | L1 | 7.7 | 14.9 |
| L2 | 38.5 | 23.4 | ||||
| L3 | 53.9 | 61.7 | ||||
| L4 | 15.4 | 5.3 | ||||
| Carroll (2016)[38] | Canada (British Columbia) | 1997-2012 | 638 (Paed) | L1 | 6.0 | 9.0 |
| L2 | 55.0 | 35.0 | ||||
| L3 | 39.0 | 55.0 | ||||
| L4a | 55.0 | 43.0 | ||||
| L4b | 1.0 | 9.0 | ||||
| L4ab | 0.0 | 8.0 | ||||
| Behaviour | ||||||
| Walker (2011)[35] | United Kingdom (NW London) | 2008-2010 | 309 | B1 | 72.3 | 58.1 |
| B2 | 22.0 | 60.0 | ||||
| B3 | 4.3 | 14.0 | ||||
| Perianal | 20.2 | 21.4 | ||||
| Goodhand (2012)[36] | United Kingdom (East London) | 2010 | 141 | B1 | 63.0 | 55.0 |
| B2 | 15.0 | 11.0 | ||||
| B3 | 20.0 | 15.0 | ||||
| Perianal | 16.0 | 3.0 | ||||
| Li (2013)[22] | United States (San Francisco) | 1994-2009 | 57 (Paed) | Perianal | 46.2 | 12.8 |
| Carroll (2016)[38] | Canada (British Columbia) | 1997-2012 | 638 (Paed) | B1 | 61.0 | 73.0 |
| B2 | 13.0 | 16.0 | ||||
| B3 | 6.0 | 3.0 | ||||
| B2B3 | 21.0 | 9.0 | ||||
South Asians compared with Caucasians. Total No. of cases reported was 1145. Significant difference in disease behaviour illustrated in bold.