Table 1 Infancy period (within 1 year) risk factors for Crohn’s disease (CD) and ulcerative colitis (UC) in crude analysis
| Â | CD | UC | ||
|---|---|---|---|---|
n = 41, % | OR (95% CI) | n = 113, % | OR (95% CI) | |
Breast feeding at least 1 month* | ||||
Yes, n = 2996 | 11, 0.37 | 0.18 (0.08–0.45) | 54, 1.80 | 1.18 (0.53–2.61) |
No, n = 457 | 9, 1.97 |  | 7, 1.53 |  |
Vitamin D supplementation** | ||||
Yes, n = 5517 | 29, 0.53 | 0.46 (0.21–1.02) | 95, 1.72 | 0.93 (0.52–1.69) |
No, n = 710 | 8, 1.13 |  | 13, 1.83 |  |
Iron supplementation*** | ||||
Yes, n = 3603 | 13, 0.36 | 0.41 (0.20–0.81) | 56, 1.53 | 0.80 (0.54–1.18) |
No, n = 2488 | 22, 0.88 |  | 48, 1.93 |  |
DTP vaccination | ||||
Yes, n = 5647 | 29, 0.51 | 0.45 (0.21–1.00) | 92, 1.63 | 0.72 (0.42–1.23) |
No, n = 712 | 8, 1.12 |  | 16, 2.25 |  |
Polio vaccination | ||||
Yes, n = 5038 | 26, 0.52 | 0.58 (0.29–1.18) | 81, 1.61 | 0.77 (0.49–1.20) |
No, n = 1247 | 11, 0.88 |  | 26, 2.00 |  |
Smallpox vaccination | ||||
Yes, n = 962 | 7, 0.73 | 1.25 (0.55–2.86) | 22, 2.29 | 1.51 (0.93–2.44) |
No, n = 4977 | 29, 0.58 |  | 76, 1.53 |  |
Antibiotics during first year | ||||
Yes, n = 3218 | 16, 0.50 | 0.75 (0.38–1.46) | 53, 1.65 | 0.92 (0.63–1.36) |
No, n = 2862 | 19, 0.66 |  | 51, 1.78 |  |