Table 2.

Incidence rate of register-based diagnosis of inflammatory bowel disease, Crohn's disease, and ulcerative colitis

Disease	Person-years of follow-up	Events	Incidence (95%CI)	Cumulative incidence (95%CI)
IBD	360,655	113	31.3 (25.8, 37.7)	0.74 (0.61, 0.89)
CD	361,537	40	11.1 (7.9, 15.1)	0.26 (0.19, 0.35)
UC	361,468	57	15.8 (11.9, 20.4)	0.38 (0.29, 0.50)

Data based on the All Babies In Southeast Sweden (ABIS) cohort until December 31, 2020

CI confidence interval, CD Crohn's disease, IBD inflammatory bowel disease, UC ulcerative colitis