Collected Dataset / MIDUS_Japan

MIDJA population consist of Noninstitutionalized Japanese-speaking adults living in one of the 23 wards of Tokyo from April 2008-September 2008.

The sample was selected from the Basic Resident Register Book for the 23 wards in Tokyo, Japan, via two-stage stratified random sampling. Within each ward 5 groups were created based on age (30-39, 40-49, 50-59, 60-69, 70-79) and stratified by gender. Thus, ten strata, based on gender and age were created. For each strata a total of 100 samples are allotted and proportionally distributed among each ward based on the number of registered residents in the Basic Resident Register Book for Tokyo, as of March 31, 2007. Approximately ten samples were assigned per sampling spot. The primary sampling unit was based on the basic survey units fixed at the 2005 National Census. The sampling spots were sampled from a table of random numbers. Respondents for each sampling spot were selected from the Basic Resident Register Book using a systematic sampling method. Two reserve samples were allotted per respondent. If the primary selected respondent was ineligible, regardless of reason, the reserve samples were used. To ensure adequate sampling of men from the three youngest decades (30-39, 40-49, 50-59), three reserve samples were allotted per respondent. If sampling could not be conducted from the basic resident register book, samples were transferred to a different ward within the same area.

Survey of Midlife Development in Japan (MIDJA) survey using a mail and an self-enumerated questionnaire.