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Changes over time in the standardized incidence rates for CD (n = 13,445) and UC n = 8803) in Northern France from 1988 to 2017 by sex and age group. a) CD incidence according to sex. b) CD incidence according to age. c) UC incidence according to sex. d) UC incidence according to age. Incidence rates with confidence intervals are given in Supplementary Table S7.
