Birth data and observed/expected cases of inflammatory bowel disease in the United Kingdom
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CD, Crohn’s disease; UC, ulcerative colitis; IBD, all cases of inflammatory bowel disease. Expected, the number of cases that would have been born in the calendar month if all differences in the number of cases per month were attributable to variation in the total number of births. “Rates”, calculated from the observed cases and total births. See text for definition of “rate”. | ||||||||||||
| UK births 1978–98 (thousands) | 1302 | 1202 | 1336 | 1296 | 1355 | 1327 | 1377 | 1344 | 1339 | 1330 | 1245 | 1257 |
| CD cases observed | 69 | 45 | 44 | 59 | 49 | 58 | 59 | 56 | 61 | 43 | 52 | 39 |
| CD cases expected | 52 | 48 | 54 | 52 | 55 | 53 | 55 | 54 | 54 | 54 | 50 | 50 |
| “Rate” of CD per 100000 births | 5.3 | 3.7 | 3.3 | 4.6 | 3.6 | 4.4 | 4.3 | 4.2 | 4.6 | 3.2 | 4.2 | 3.1 |
| UC cases observed | 26 | 26 | 23 | 17 | 29 | 20 | 20 | 25 | 20 | 24 | 20 | 27 |
| UC cases expected | 23 | 21 | 24 | 23 | 24 | 23 | 24 | 24 | 24 | 23 | 22 | 22 |
| “Rate” of UC per 100000 births | 2.0 | 2.2 | 1.7 | 1.3 | 2.1 | 1.5 | 1.5 | 1.9 | 1.5 | 1.8 | 1.6 | 2.2 |
| IBD cases observed | 103 | 81 | 80 | 88 | 88 | 91 | 88 | 92 | 89 | 80 | 82 | 78 |
| IBD cases expected | 86 | 79 | 87 | 86 | 90 | 87 | 91 | 89 | 89 | 88 | 82 | 83 |
| “Rate” of all IBD per 100000 births | 7.9 | 6.7 | 6.0 | 6.8 | 6.5 | 6.9 | 6.4 | 6.8 | 6.6 | 6.0 | 6.6 | 6.2 |