Table 3

Distribution of summer (March–August) versus winter (September–February) births in coeliac disease (CD) patients and controls, stratified by gender and year of diagnosis

Summer birthsWinter birthsOR (95% CI)p ValueTest for heterogeneity of ORs
Gender0.2427
Male
 CD patients6080 (55)5011 (45)1.08 (1.03 to 1.12)0.0004
 Controls29131 (53)25847 (47)
Female
 CD patients9662 (54)8343 (46)1.04 (1.01 to 1.08)0.0091
 Controls47099 (53)42445 (47)
Calendar period0.0274
≤1989
 CD patients2245 (55)1860 (45)1.11 (1.04 to 1.19)0.0028
 Controls10624 (52)9754 (48)
1990–1999
 CD patients6.605 (55)5454 (45)1.08 (1.04 to 1.13)<0.0001
 Controls31625 (53)28249 (47)
≥2000
 CD patients6892 (53)6040 (47)1.02 (0.98 to 1.06)0.3805
 Controls339891 (53)30289 (47)