Table 1.
Study Characteristics
| Quartile 1 (n=469) |
Quartile 2 (n=526) |
Quartile 3 (n=563) |
Quartile 4 (n=466) |
p-value | |
|---|---|---|---|---|---|
| Female, n(%) | 248 (52.9) | 278 (52.9) | 287 (51.0) | 241 (51.7) | 0.909 |
| Age, mean (SD) | 35.1 (±12.8) | 42.3 (±16.1) | 43.0 (±14.9) | 42.2 (±15.0) | 0.044 |
| Age at diagnosis, mean (SD) | 25.4 (±12.1) | 30.8 (±14.6) | 30.3 (+14.3) | 30.0 (±14.3) | 0.023 |
| Duration disease, mean (SD) | 9.6 (±9.0) | 11.3 (±12.1) | 12.6 (±11.9) | 11.9 (±11.2) | <0.001 |
| Smoking, n(%) | 0.001 | ||||
| Never | 341 (74.5) | 326 (63.8) | 353 (63.7) | 278 (61.1) | |
| Former | 96 (20.96) | 142 (27.8) | 164 (29.6) | 143 (31.4) | |
| Current | 21 (4.6) | 43 (8.4) | 37 (6.7) | 34 (7.5) | |
| High level education, n(%) | 394 (87.56) | 354 (69.01) | 345 (63.7) | 260 (58.2) | <0.001 |
| Working, n(%) | 409 (88.9) | 403 (77.7) | 418 (75.3) | 352 (77.9) | <0.001 |
| IBD type, n(%) | 0.157 | ||||
| CD | 243 (51.8) | 285 (54.2) | 326 (57.9) | 269 (57.7) | |
| UC | 226 (48.2) | 241 (45.8) | 237 (42.1) | 197 (42.3) | |
| CD location, n(%) | 0.801 | ||||
| TI (L1) | 57 (25.8) | 61 (24.0) | 75 (25.7) | 61 (26.0) | |
| Colon (L2) | 53 (24.0) | 70 (27.6) | 73 (25.0) | 55 (23.4) | |
| Ileocolon (L3) | 111 (50.23) | 122 (48.0) | 144 (49.3) | 117 (49.8) | |
| Upper GI (L4) | 0 (0) | 1 (0.4) | 0 (0) | 2 (0.9) | |
| CD behavior, n(%) | 0.060 | ||||
| Inflammatory (B1) | 129 (57.6) | 135 (50.9) | 136 (45.6) | 108 (44.4) | |
| Stricturing (B2) | 39 (17.4) | 58 (21.9) | 62 (20.8) | 60 (24.7) | |
| Penetrating (B3) | 56 (25.0) | 72 (27.2) | 100 (33.6) | 75 (30.9) | |
| CD perianal disease, n(%) | 55 (24.6) | 70 (26.4) | 79 (26.5) | 65 (26.8) | 0.946 |
| UC extent, n(%) | 0.425 | ||||
| Limited colitis | 88 (44.4) | 103 (47.9) | 104 (49.5) | 67 (41.6) | |
| Pancolitis | 110 (55.6) | 112 (52.1) | 106 (50.5) | 94 (58.4) |
The mean distance from our hospital was 2.5 miles, 8.8 miles, 22.0 miles, and 50.8 miles for the first (most proximal) through fourth (most distant) respectively.