| All patients (SD) (n = 101) | Relapsers (SD) (n = 37) | Non-relapsers (SD) (n = 64) | HR (95% CI) | p Value | |
| Age (years) | 33.6 (12.9) | 33.4 (12.5) | 33.7 (13.2) | 0.99 (0.97 to 1.02) | 0.64 |
| Gender (F:M) | 60:41 | 22:15 | 38:26 | 0.89 (0.5 to 1.7) | 0.73 |
| CDAI baseline | 66 (38.9) | 67 (41.2) | 66 (37.9) | 1.00 (0.99 to 1.01) | 0.73 |
| Disease duration (months) | 90 (82.4) | 95.8 (93.4) | 86.9 (76.0) | 1.00 (1.00 to 1.00) | 0.86 |
| Duration remission (months) | 11 (8.2) | 10.3 (7.8) | 11.8 (8.4) | 0.98 (0.94 to 1.02) | 0.33 |
| Number of prior relapses | 4.1 (3.9) | 4.1 (3.8) | 4.0 (4.0) | 1.00 (0.92 to 1.09) | 0.98 |
| Extraintestinal disease (%) | 28 | 32 | 25 | 1.4 (0.7 to 2.9) | 0.31 |
| Previous resection (%) | 16 | 19 | 14 | 1.4 (0.6 to 3.2) | 0.42 |
| Disease behaviour (%) | |||||
| Fistulising | 22 | 27 | 19 | 1.5 (0.7 to 3.1) | 0.26 |
| Inflammatory | 71 | 68 | 73 | 0.8 (0.4 to 1.6) | 0.54 |
| Stricturing | 7 | 5 | 8 | 0.6 (0.2 to 2.6) | 0.53 |
| Disease site (%) | |||||
| Ileitis | 30 | 32 | 28 | 1.1 (0.5 to 2.2) | 0.80 |
| Ileocolitis | 38 | 27 | 44 | 0.6 (0.3 to 1.2) | 0.16 |
| Colitis | 32 | 41 | 28 | 1.5 (0.8 to 2.9) | 0.22 |
| Perianal fistula (%) | 14 | 14 | 14 | 0.9 (0.3 to 2.2) | 0.8 |
| Medications (%) | |||||
| None | 24 | 30 | 20 | 1.4 (0.7 to 2.8) | 0.36 |
| 5-ASA | 52 | 51 | 53 | 0.95 (0.5 to 1.8) | 0.87 |
| Purine analogues | 23 | 16 | 27 | 0.6 (0.26 to 1.5) | 0.28 |
| Methotrexate | 1 | 3 | 0 | ||
| Smoking (%) | 31 | 27 | 33 | 0.8 (0.4 to 1.7) | 0.59 |
| OC (%); n = 60 | |||||
| Current | 35 | 32 | 37 | 0.8 (0.3 to 1.9) | 0.60 |
5-ASA, 5-aminosalicylic acid; CDAI, Crohn’s Disease Activity Index; F, female; M, male; OC, oral contraceptive.