Kawakami, N, Iwata, N, Fujihara, S et al. · The Tohoku journal of experimental medicine · 1998 · DOI
This Japanese study looked at how common ME/CFS is in everyday communities by interviewing 137 people. Researchers found that about 1 in 67 people had severe, persistent fatigue that met ME/CFS criteria and significantly disrupted their daily life. The findings suggested ME/CFS might be more common in Japan than in Western countries studied previously.
This study provides rare international prevalence data for ME/CFS outside Western populations, highlighting that the disease occurs globally and may manifest differently across cultures. Understanding cross-cultural differences in disease prevalence and presentation is crucial for developing culturally-informed diagnostic approaches and ensuring ME/CFS is recognized in diverse populations.
This study does not establish causation for ME/CFS or identify why prevalence might differ between Japan and Western countries. The small sample size (n=137) and single-site Japanese sample limit generalizability, and the study cannot distinguish between true epidemiological differences versus differences in diagnostic criteria application, healthcare-seeking behavior, or symptom interpretation across cultures.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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