Table 1.
Characteristics of the Study Population at Study Entry
| Variables | Small bowel resection |
Large bowel resection |
||||
|---|---|---|---|---|---|---|
| Patients with CD |
Patients with CD |
Patients with UC |
||||
| Yes (N = 2469) | No (N = 12,331) | Yes (N = 1361) | No (N = 6763) | Yes (N = 3787) | No (N = 18,932) | |
| Matching variables | ||||||
| Age at bowel resection / match date | ||||||
| <20 y | 207 (8.4) | 995 (8.1) | 84 (6.2) | 353 (5.2) | 215 (5.7) | 838 (4.4) |
| 20–39 y | 1252 (50.7) | 6341 (51.4) | 513 (37.7) | 2644 (39.1) | 1371 (36.2) | 7088 (37.4) |
| 40–59 y | 626 (25.4) | 3096 (25.1) | 406 (29.8) | 2005 (29.6) | 1097 (29.0) | 5522 (29.2) |
| ≥60 y | 384 (15.6) | 1899 (15.4) | 358 (26.3) | 1761 (26.0) | 1104 (29.2) | 5484 (29.0) |
| Sex | ||||||
| Women | 1393 (56.4) | 6955 (56.4) | 761 (55.9) | 3782 (55.9) | 1838 (48.5) | 9188 (48.5) |
| Men | 1076 (43.6) | 5376 (43.6) | 600 (44.1) | 2981 (44.1) | 1949 (51.5) | 9744 (51.5) |
| Duration of IBD | ||||||
| <1 y | 1217 (49.3) | 5597 (45.4) | 555 (40.8) | 2577 (38.1) | 1308 (34.5) | 6120 (32.3) |
| 1–5 y | 671 (27.2) | 3830 (31.1) | 338 (24.8) | 1886 (27.9) | 1169 (30.9) | 6293 (33.2) |
| 5–10 y | 327 (13.2) | 1646 (13.3) | 239 (17.6) | 1182 (17.5) | 565 (14.9) | 2825 (14.9) |
| ≥10 y | 254 (10.3) | 1258 (10.2) | 229 (16.8) | 1118 (16.5) | 745 (19.7) | 3694 (19.5) |
| Other variables | ||||||
| Year of bowel resection/match date | ||||||
| 1996–2003 | 784 (31.8) | 3919 (31.8) | 480 (35.3) | 2381 (35.2) | 1223 (32.3) | 6115 (32.3) |
| 2004–2011 | 822 (33.3) | 4105 (33.3) | 487 (35.8) | 2420 (35.8) | 1391 (36.7) | 6952 (36.7) |
| 2012–2018 | 863 (35.0) | 4307 (34.9) | 394 (28.9) | 1962 (29.0) | 1173 (31.0) | 5865 (31.0) |
| Type of bowel resection | ||||||
| Small bowel resections | ||||||
| Ileocecal resection | 1955 (79.2) | - | - | - | - | |
| Other | 514 (20.8) | - | - | - | - | |
| Large bowel resections | ||||||
| Total colectomy | - | - | 601 (44.2) | - | 3140 (82.9) | - |
| Right-sided colectomya | - | - | 443 (32.5) | - | 254 (6.7) | - |
| Left-sided colectomyb | - | - | 256 (18.8) | - | 302 (8.0) | - |
| Other | - | - | 61 (4.5) | - | 91 (2.4) | - |
CD, Crohn’s disease; UC, ulcerative colitis.
a
Right-sided colectomy included right hemicolectomy and resection of colon transversum.
b
Left-sided colectomy included left hemicolectomy and sigmoidectomy.