Table 1. Basic characteristics of the included articles.
| First author | Year | Country | Ulcerative colitis (case) | Colorectal cancer (case) | Incidence of colorectal cancer (%) |
|---|---|---|---|---|---|
| Desai (11) | 2015 | India | 430 | 12 | 2.80 |
| Shivakumar (12) | 2013 | India | 29 | 1 | 3.40 |
| Venkataraman (13) | 2005 | India | 532 | 5 | 0.94 |
| Kim (14) | 2009 | South Korea | 7,061 | 26 | 0.37 |
| Hilmi (15) | 2009 | Malaysia | 118 | 0 | 0.00 |
| Al-Shamali (16) | 2003 | Kuwait | 346 | 0 | 0.00 |
| Kekilli (17) | 2010 | Turkey | 275 | 3 | 1.10 |
| Kamiya (18) | 2015 | Japan | 1,583 | 25 | 1.70 |
| Zhang (19) | 2015 | China | 624 | 4 | 0.64 |
| Gilat (20) | 1988 | Israel | 1,035 | 26 | 2.51 |
| Senanayake (21) | 2013 | Sri Lanka | 3,428 | 2 | 0.50 |