Characteristics of studies included
| Category 1 (n=75)1-150 | Category 2 (n=22)1-151 | Category 3 (n=19)‡ | |
| Study design | |||
| Referral centre | 55 | 11 | 8 |
| Surgical series | 14 | — | 3 |
| Surveillance programme | 3 | 6 | 2 |
| Population/inception cohort | 2 | 5 | 6 |
| Private practice | — | — | 1 |
| Histology series | 1 | — | — |
| Retrospective | 70 | 11 | 12 |
| Referred cancers included | |||
| Yes | 10 | 1 | 1 |
| Missing data | 41 | 3 | 5 |
| Country | |||
| USA | 41 | 7 | 4 |
| UK | 8 | 4 | 7 |
| Scandinavia | 12 | 6 | 3 |
| Other | 14 | 5 | 5 |
| Surgical intervention rate (SD) | 22% (19.5) | 24.7% (15.0) | 25.1% (20.8) |
| 38 studies | 20 studies | 12 studies | |
| Pan-proctocolectomy rate (SD) | 10.7% (20.0) | 9.1% (8.6) | 16.4% (19.0) |
| 22 studies | 7 studies | 7 studies |
↵1-150 References7 ,81 ,94-96 ,99 ,101-108 ,110 ,113-117 120-122 ,124 ,127 ,128 ,132 ,133 ,135-138 ,140 ,142 ,143 ,145 ,148 ,150 ,155 ,157 ,159 ,161 ,163 ,165 ,167 ,170-173 ,176 177 180–182 185–189 191–205
↵1-151 References93 ,98 ,100 ,109 ,112 ,123 ,126 ,134 ,141 ,146 ,147 ,149 ,151-154 ,158 ,160 ,162 ,166 ,168 ,169 ,175
‡References10 ,97 ,111 ,118 ,119 ,125 ,129-131 ,139 ,144 ,156 ,164 ,174 ,178 ,179 ,183 ,184 ,190