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Medical costs of patients with hypertension and/or diabetes: a 10-year follow-up study of National Health Insurance in Shiga, Japan

Nakamura, Koshia; Okamura, Tomonoria; Kanda, Hideyukib; Hayakawa, Takehitoc; Okayama, Akirad; Ueshima, Hirotsuguafor the Health Promotion Research Committee of the Shiga National Health Insurance Organizations

doi: 10.1097/01.hjh.0000249711.28769.80
Original papers: Cost analysis

Background and methods A cohort study investigating medical costs associated with the combination of hypertension and diabetes was conducted. The participants included 4535 community-dwelling Japanese individuals, aged 40–69 years, who were classified into the following four categories: ‘Neither hypertension nor diabetes’, ‘Hypertension alone’, ‘Diabetes alone’ or ‘Both hypertension and diabetes’. Medical costs per person per month were compared among the four categories.

Results and conclusion Of the study population, 1.3% had both hypertension and diabetes. During the 10-year follow-up period, participants with both hypertension and diabetes incurred higher medical costs, as compared with those without hypertension, diabetes or their combination, even after adjustment for other confounding factors.

aDepartment of Health Science, Shiga University of Medical Science, Otsu City, Shiga

bDepartment of Hygiene and Preventive Medicine, Fukushima Medical University, Fukushima City, Fukushima

cDepartment of Public Health Science, Shimane University School of Medicine, Izumo City, Shimane

dDepartment of Preventive Cardiology, National Cardiovascular Center, Suita City, Osaka, Japan

*Members of the committee are listed in the Appendix.

Received 29 January, 2006

Accepted 30 June, 2006

Correspondence and requests for reprints to Koshi Nakamura, MD, PhD, Department of Health Science, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu City, Shiga, 520-2192, Japan Tel: +81 77 548 2191; fax: +81 77 543 9732; e-mail:

Sponsorship: The study was funded by a research grant from the Ministry of Health, Labour and Welfare (H17-kenko-007).

© 2006 Lippincott Williams & Wilkins, Inc.