Background/Aims: Symptoms of irritable bowel syndrome (IBS), a common gut-brain interaction disorder, deteriorate patients’ quality of life and increase medical needs; therefore, IBS represents a significant global burden. The estimated global prevalence is approximately 10%; however, accumulated evidence shows international heterogeneity. In this study, we have described and compared the prevalence of IBS in 3 East Asian countries: Japan (Tokyo and Fukuoka), China (Beijing), and South Korea (Seoul). Methods: We conducted an internet-based cross-sectional survey of the urban population aged > 20 years in the abovementioned countries. We recruited equal numbers of age- (20s-60s) and sex-matched participants (3910 residents). IBS was diagnosed according to the Rome III criteria, and the subtypes were analyzed. Results: The overall prevalence of IBS with 95% CI was 12.6% (11.6-13.7); the prevalence was significantly different across Japan, China, and South Korea (14.9% [13.4-16.5], 5.5% [4.3-7.1], and 15.6% [13.3-18.3], respectively) (P < 0.001). Furthermore, 54.9% of patients were male. IBS-mixed was the most prevalent subtype; the prevalence of other subtypes varied. Conclusions The overall prevalence of IBS in the 3 countries was slightly higher than the global prevalence, and it was significantly lower in China than in Japan and South Korea. IBS prevalence was the highest and lowest among individuals in their 40s and 60s, respectively. Male individuals had a higher prevalence of IBS with diarrhea. Further studies are needed to elucidate the factors associated with this regional heterogeneity.

Introduction : We initiated an ambulatory care training program at five community hospitals in Nagasaki, including hospitals on remote islands, for the residents of Nagasaki University Hospital. We examined the educational effect of the ambulatory care training program in meeting the achievement targets for clinical training.
Methods : The study included all residents (n=49) working in Nagasaki University Hospital in 2012. Following completion of the ambulatory care training program, the residents answered a questionnaire on the number of patients and their symptoms, inaddition to a self-assessment, and assessment by their supervisor.
Results : The mean number of patients seen was 3.29 persons / training session. The number of symptoms to be encountered, which are established by Ministry of Health, Labour and Welfare, was positively correlated with the total number of patients seen. Although residents initially had a low rating of self-assessment on diagnosis or treatment, this rating tended to increase with time. The gap in levels on assessment of history taking, diagnosis, or treatment by residents versus those by the supervisors reduced with time in the program.
Conclusion : Our ambulatory care training program is an effective program for meeting the achievement targets in clinical training for residents.