Journal of Epidemiology
Online ISSN : 1349-9092
Print ISSN : 0917-5040
ISSN-L : 0917-5040
Study Profile
The Ohsaki Cohort 2006 Study: Design of Study and Profile of Participants at Baseline
Shinichi Kuriyama, Naoki Nakaya, Kaori Ohmori-Matsuda, Taichi Shimazu, Nobutaka Kikuchi, Masako Kakizaki, Toshimasa Sone, Fumi Sato, Masato Nagai, Yumi Sugawara, Yasutake Tomata, Munira Akhter, Mizuka Higashiguchi, Naru Fukuchi, Hideko Takahashi, Atsushi Hozawa, Ichiro Tsuji
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Keywords: long-term care insurance, population-based, psychosocial factors, study design, the Ohsaki Cohort 2006 Study
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2010 Volume 20 Issue 3 Pages 253-258

View "Advance Publication" version (April 10, 2010).
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Abstract

Background: Large-scale cohort studies conducted in Japan do not always include psychosocial factors as exposures. In addition, such studies sometimes fail to satisfactorily evaluate disability status as an outcome.
Methods: This prospective cohort study comprised 49 603 (22 438 men and 27 165 women) community-dwelling adults aged 40 years or older who were included in the Residential Registry for Ohsaki City, Miyagi Prefecture, in northeastern Japan. The baseline survey, which included psychosocial factors, was conducted in December 2006. Follow-up of death, immigration, cause of death, cancer incidence, and long-term care insurance certification was started on 1 January 2007.
Results: The response rate was 64.2%. In general, lifestyle-related conditions in the study population were similar to those of the general Japanese population; however, the proportion of male current smokers was higher in the cohort. The association between age and the proportion of those reporting psychological distress showed a clear U-shaped curve, with a nadir at age 60 to 69 years in both men and women, although more women were affected by such distress than men. The proportion of those who reported a lack of social support was highest among those aged 40 to 49 years. Most men and women surveyed did not participate in community activities. Among participants aged 65 years or older, 10.9% of participants were certified beneficiaries of the long-term care insurance system at baseline.
Conclusions: The Ohsaki Cohort 2006 Study is a novel population-based prospective cohort study that focuses on psychosocial factors and long-term care insurance certification.

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© 2010 by the Japan Epidemiological Association
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