Familial history of IBD | | 5 | 1.45–17.2 |
Pairs with exposed cases/non-exposed controls | 15 | | |
Pairs with non-exposed cases/exposed controls | 3 | | |
Concordant pairs | 42 | | |
Disease during pregnancy* | | 4.7 | 1.3–16.1 |
Pairs with exposed cases/non-exposed controls | 14 | | |
Pairs with non-exposed cases/exposed controls | 3 | | |
Concordant pairs | 43 | | |
Sucrose supplemented milk | | 2.25 | 1–5.2 |
Pairs with exposed cases/non-exposed controls | 18 | | |
Pairs with non-exposed cases/exposed controls | 8 | | |
Concordant pairs | 34 | | |
Appendicectomy | | 0.3 | 0.1–0.95 |
Pairs with exposed cases/non-exposed controls | 3 | | |
Pairs with non-exposed cases/exposed controls | 11 | | |
Concordant pairs | 46 | | |
Smallpox vaccination | | 10 | 1.3–208 |
Pairs with exposed cases/non-exposed controls | 10 | | |
Pairs with non-exposed cases/exposed controls | 1 | | |
Concordant pairs | 49 | | |
Poliomyelitis vaccination | | 7 | 1.1–151 |
Pairs with exposed cases/non-exposed controls | 7 | | |
Pairs with non-exposed cases/exposed controls | 1 | | |
Concordant pairs | 52 | | |
Bedroom sharing | | 3.4 | 1.5–7.9 |
Pairs with exposed cases/non-exposed controls | 24 | | |
Pairs with non-exposed cases/exposed controls | 7 | | |
Concordant pairs | 29 | | |