Journal of Gastroenterology

, Volume 45, Issue 9, pp 911–917 | Cite as

Inflammatory bowel disease in children: epidemiological analysis of the nationwide IBD registry in Japan

  • Takashi IshigeEmail author
  • Takeshi Tomomasa
  • Tohru Takebayashi
  • Keiko Asakura
  • Mamoru Watanabe
  • Tomoko Suzuki
  • Reiko Miyazawa
  • Hirokazu Arakawa
Original Article—Alimentary Tract



We analyzed the database of the Japanese nationwide inflammatory bowel disease (IBD) registry, which was started in 1975, to characterize basic epidemiological and clinical features of childhood IBD, comparing them to those in adults.

Study design

We analyzed the age of disease onset, disease severity and anatomical distribution in patients that were newly registered between 2003 and 2006 (n = 2,940 for CD and 14,857 for UC). We also analyzed the current age, gender and family history of IBD of all patients filed in 2005, which included patients who were newly registered in 2005 and those who had been registered before 2005 and for whom an annual report had been received in 2005 (total number of subjects: 10,934 for CD and 37,846 for UC).


At the time of registration, 10.6% of CD and 5.9% of UC patients were ≤16 years old. In CD, the male to female ratio was 2.6 in adult- and 1.7 in childhood-onset patients (P < 0.001). In UC, the male to female ratio was close to 1 in both age groups. In comparison with adults, pediatric patients more commonly had a positive family history for CD and UC (P < 0.001), tended to have more severe disease at the time of registry (P < 0.001 for CD, P < 0.05 for UC) and more often had extensive colitis in UC (P < 0.001).


The nationwide registry in Japan showed IBD in children has clinical features that are distinct from those in adults.


Crohn’s disease Incidence Ulcerative colitis Montreal classification Child 



This study was supported by a grant from “Intractable diseases, the Health and Labour Sciences Research Grants from the Ministry of Health, Labour and Welfare.”

Conflict of interest statement



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Copyright information

© Springer 2010

Authors and Affiliations

  • Takashi Ishige
    • 1
    Email author
  • Takeshi Tomomasa
    • 1
    • 2
  • Tohru Takebayashi
    • 3
  • Keiko Asakura
    • 3
  • Mamoru Watanabe
    • 4
  • Tomoko Suzuki
    • 1
  • Reiko Miyazawa
    • 1
  • Hirokazu Arakawa
    • 1
  1. 1.Department of PediatricsGunma University Graduate School of MedicineMaebashiJapan
  2. 2.PAL Children’s ClinicIsesakiJapan
  3. 3.Department of Preventive Medicine and Public HealthKeio University School of MedicineTokyoJapan
  4. 4.Department of Gastroenterology and HepatologyTokyo Medical and Dental UniversityTokyoJapan

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