Table 3 Infancy period (within 1 year) risk factors for Crohn’s disease (CD) and ulcerative colitis (UC) by logistic regression
|  | CD, n = 41, OR (with 95% CI) | UC, n = 113, OR (with 95% CI) |
|---|---|---|
Breast feeding* No, (ref) n = 448 Yes, n = 2985 | n = 9 n = 11, 0.18 (0.08–0.44) | n = 7 n = 54, 1.05 (0.47–2.32) |
Iron supplementation** No, (ref) n = 2 488 Yes, n = 3 606 | n = 22 n = 13, 0.43 (0.21–0.89) | n = 48 n = 56, 0.72 (0.48–1.09) |
DTP vaccination No, (ref) n = 712 Yes, n = 5 647 | n = 8 n = 29, 0.55 (0.23–1.34) | n = 16 n = 92, 0.74 (0.42–1.32) |
Polio vaccination No, (ref) n = 1 247 Yes, n = 5 038 | n = 11 n = 26, 0.66 (0.31–1.44) | n = 26 n = 86, 0.82 (0.51–1.31) |