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Historical changes in epidemiology of diffuse panbronchiolitis.
C Kono1, T Yamaguchi, Y Yamada
1Department of Respiratory Medicine, Japan Railway Tokyo General Hospital, Japan. Japan.
Summary
Diffuse panbronchiolitis (DPB) incidence and prevalence appear to be declining in Japan. This study observed a significant decrease in DPB cases over a 27-year period in a large company.
Area of Science:
- Pulmonology
- Epidemiology
- Respiratory Medicine
Background:
- Japanese pulmonologists noted a decline in new diffuse panbronchiolitis (DPB) cases before the 1980s.
- No prior epidemiological data supported this clinical observation of reduced DPB incidence.
Purpose of the Study:
- To investigate the epidemiological trends of diffuse panbronchiolitis (DPB).
- To provide data supporting the observed rarity of new DPB cases in Japan.
Main Methods:
- Utilized computerized health records from JR East Company employees (1976-2003).
- Identified DPB patients and conducted follow-up assessments across three distinct periods: 1976-1980, 1989-1993, and 1999-2003.
Main Results:
- 11 DPB cases (4 incidence, 7 prevalence) were found in 1976-1980 (355,572 workers).
- 3 DPB cases (1 incidence, 2 prevalence) were identified in 1989-1993 (180,359 workers).
- No DPB cases were detected in 1999-2003 (144,485 workers).
Conclusions:
- The epidemiological data suggest a significant decrease in both incidence and prevalence of DPB.
- This trend supports the clinical observation of DPB becoming a rare event in Japan.
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