The changing pattern of Crohn's disease incidence according to age in northern France: a continuing increase in the 10-19-year-old age bracket (1988-2007).

Vincent Chouraki (1) , Guillaume Savoye (2) , Luc Dauchet (1) , Gwenola Vernier-Massouille (3) , Jean-Louis Dupas (4) , Veronique Merle (5) , Eric Laberenne (6) , Jean-Louis Salomez (1) , Eric Lerebours (2) , Dominique Turck (7) , Antoine Cortot (8) , Corinne Gower (9) , Jean-Frédéric Colombel (10)

1 Epidemiology
2 Service d'Hépato-Gastroentérologie [CHU Rouen]
3 Hepato Gastroenterology
4 Hepato-Gastroenterologie
5 Epidemiology
6 Service d'Hépato-Gastroenterologie [Seclin]
7 Pediatrics
8 Hepatogastroenterology
9 Registre EPIMAD
10 Service d'Hépato-gastroentérologie

Background: Crohn's disease (CD) incidence rates have stabilized in industrialized countries since the 1980's. Conversely, a continuing increase in childhood-onset CD incidence has been reported. Aim: To confirm trends in inflammatory bowel disease (IBD) incidence in northern France over an extended time period (1988-2007) with a focus on childhood-onset CD. Methods: IBD patients recorded in the EPIMAD registry between 1988 and 2007 were included. Standardized incidence rates were calculated for CD and ulcerative colitis (UC) in the entire population, and separately according to age. Evolution of phenotypes at diagnosis was also studied. Results: 12,084 incident IBD cases (7,428 CD and 4,656 UC) were recorded. CD incidence rates increased from 5.2 cases/100,000 persons in 1988-1990 to 6.7 in 2006-2007 (+29%), stabilizing after a peak at 7.1 in 1997-1999. CD incidence rates in the 10-19-year age category increased by 71%, from 6.5 (1988-1990) to 11.1 (2006-2007). The frequency of initial ileo-colonic localization increased from 52.9% in 1988-1990 to 68.6% in 2006-2007 (p<0.0001). UC incidence rates decreased during the same period. Conclusion: From 1988 to 2007, CD incidence increased by 29% in northern France and by 71% in the 10-19-year-old age group. Consequently, studies on CD risk factors should focus on the population under 20 years of age.

Mots clés: Medicine

Vincent Chouraki, Guillaume Savoye, Luc Dauchet, Gwenola Vernier-Massouille, Jean-Louis Dupas, et al.. The changing pattern of Crohn's disease incidence according to age in northern France: a continuing increase in the 10-19-year-old age bracket (1988-2007).. Alimentary Pharmacology and Therapeutics, 2011, 33 (10), pp.1133. ⟨10.1111/j.1365-2036.2011.04628.x⟩. ⟨hal-00624176⟩