Gastroduodenal Ulcers and ABO Blood Group: the Japan Nurses’ Health Study (JNHS)

Lobna Alkebsi, Yuki Ideno, Jung Su Lee, Shosuke Suzuki, Junko Nakajima-Shimada, Hiroshi Ohnishi, Yasunori Sato, Kunihiko Hayashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Background: Although several studies have shown that blood type O is associated with increased risk of peptic ulcer, few studies have investigated these associations in Japan. We sought to investigate the association between the ABO blood group and risk of gastroduodenal ulcers (GDU) using combined analysis of both retrospective and prospective data from a large cohort study of Japanese women, the Japan Nurses’ Health Study (JNHS; n = 15,019). Methods: The impact of the ABO blood group on GDU risk was examined using Cox regression analysis to estimate hazard ratios (HRs) and 95% confidence intervals (CI), with adjustment for potential confounders. Results: Compared with women with non-O blood types (A, B, and AB), women with blood type O had a significantly increased risk of GDU from birth (multivariable-adjusted HR 1.18; 95% CI, 1.04–1.34). Moreover, the highest cumulative incidence of GDU was observed in women born pre-1956 with blood type O. In a subgroup analysis stratified by birth year (pre-1956 or post-1955), the multivariable-adjusted HR of women with blood type O was 1.22 (95% CI, 1.00–1.49) and 1.15 (95% CI, 0.98–1.35) in the pre-1956 and post-1955 groups, respectively. Conclusion: In this large, combined, ambispective cohort study of Japanese women, older women with blood type O had a higher risk of developing GDU than those with other blood types.

Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalJournal of epidemiology
Issue number1
Publication statusPublished - 2018
Externally publishedYes


  • ABO blood group
  • Health Study
  • Japan Nurses’
  • gastroduodenal ulcer

ASJC Scopus subject areas

  • Epidemiology


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