Summer births | Winter births | OR (95% CI) | p Value | Test for heterogeneity of ORs | |
---|---|---|---|---|---|
Gender | 0.2427 | ||||
Male | |||||
CD patients | 6080 (55) | 5011 (45) | 1.08 (1.03 to 1.12) | 0.0004 | |
Controls | 29131 (53) | 25847 (47) | |||
Female | |||||
CD patients | 9662 (54) | 8343 (46) | 1.04 (1.01 to 1.08) | 0.0091 | |
Controls | 47099 (53) | 42445 (47) | |||
Calendar period | 0.0274 | ||||
≤1989 | |||||
CD patients | 2245 (55) | 1860 (45) | 1.11 (1.04 to 1.19) | 0.0028 | |
Controls | 10624 (52) | 9754 (48) | |||
1990–1999 | |||||
CD patients | 6.605 (55) | 5454 (45) | 1.08 (1.04 to 1.13) | <0.0001 | |
Controls | 31625 (53) | 28249 (47) | |||
≥2000 | |||||
CD patients | 6892 (53) | 6040 (47) | 1.02 (0.98 to 1.06) | 0.3805 | |
Controls | 339891 (53) | 30289 (47) |