Cohort Mortality and Cancer Incidence Tracking

As follow-up information, dates and causes of death were annually or biannually confirmed, with the permission of the Director-General of the Prime Minister’s Office (Ministry of Public Management, Home Affairs, Post and Telecommunications) and/or the Ministry of Health, Labor and Welfare, Japan. The date of move-out of cohort members from the study area was also annually or biannually verified by the investigator in cooperation with key members of the local governmental office. In 24 of the 45 areas, data on cancer incidence such as date of diagnosis and primary site were also collected through population-based cancer registers or by reviewing the records of local major hospitals. In most areas, follow-up was completed at the end of 2009; however, it was stopped at the end of 1999 in 4 areas, at the end of 2003 in another 4 areas, and at the end of 2008 in 2 areas.

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Tamakoshi A., Ozasa K., Fujino Y., Suzuki K., Sakata K., Mori M., Kikuchi S, & Iso H. (2013). Cohort Profile of the Japan Collaborative Cohort Study at Final Follow-up. Journal of Epidemiology, 23(3), 227-232.

Publication 2013

Cancer Diagnosis Labor Minister

Corresponding Organization :

Other organizations : Hokkaido University, Radiation Effects Research Foundation, University of Occupational and Environmental Health Japan, Fujita Health University, Iwate Medical University, Sapporo Medical University, Aichi Medical University, Osaka University

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Variable analysis

independent variables

Not explicitly mentioned

dependent variables

Date of death
Cause of death
Date of move-out of cohort members from the study area
Date of diagnosis of cancer
Primary site of cancer

control variables

Permission of the Director-General of the Prime Minister's Office (Ministry of Public Management, Home Affairs, Post and Telecommunications) and/or the Ministry of Health, Labor and Welfare, Japan
Cooperation with key members of the local governmental office to verify date of move-out of cohort members

controls

Positive control: Population-based cancer registers or review of records of local major hospitals used to collect data on cancer incidence
Negative control: Follow-up stopped at different time points in some areas (end of 1999, 2003, 2008)

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