Survey of Midlife in Japan (MIDJA): Biomarker Project, 2009-2010 (ICPSR 34969)

Principal Investigator(s): Markus, Hazel, Stanford University; Coe, Christopher, University of Wisconsin; Ryff, Carol, University of Wisconsin; Karasawa, Mayumi, Tokyo Woman's Christian University; Kawakami, Norito, University of Tokyo; Kitayama, Shinobu, University of Michigan


The MIDJA Biomarker study obtained biological assessments from a subsample (n=382) of MIDJA Survey (ICPSR 30822) respondents (N=1027). Participants traveled to a clinic near the University of Tokyo campus where Biomarker data (vital signs, morphometric assessments, blood assays, and medication data) were obtained. Participants also provided daily saliva samples for cortisol assessment and completed a self-administered medical history questionnaire. The questionnaire included assessments of conditions and symptoms, major health and life events, nutrition/diet, and additional psychosocial measures (anxiety, depression, relationship quality, control etc.). These measures parallel those in a national longitudinal sample of midlife Americans known as MIDUS (ICPSR 4652: MIDUS II and ICPSR 2760: MIDUS I). The central objective is to compare the Japanese sample (MIDJA) with the United States sample (MIDUS) to test the hypotheses regarding cultural differences in aging health and well-being as well as in how psychosocial factors are linked with biological factors known to influence profiles of disease and disability.

Series: Midlife in the United States (MIDUS) Series

Access Notes

  • The public-use data files in this collection are available for access by the general public. Access does not require affiliation with an ICPSR member institution.


Study Description


Markus, Hazel, Christopher Coe, Carol Ryff, Mayumi Karasawa, Norito Kawakami, and Shinobu Kitayama. Survey of Midlife in Japan (MIDJA): Biomarker Project, 2009-2010. ICPSR34969-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2014-07-03.

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Scope of Study

Subject Terms:    aging, biomarkers, crosscultural differences, health status, older adults

Smallest Geographic Unit:    city

Geographic Coverage:    Asia, Global, Japan, Tokyo

Time Period:   

  • 2009-01--2010-04

Date of Collection:   

  • 2009-01--2010-04

Unit of Observation:    individual

Universe:    A subsample of the MIDJA Survey sample (ICPSR 30822) which is comprised of non-institutionalized, Japanese-speaking adults, aged 30-79 and living in one of the 23 wards of Tokyo from April 2008-September 2008.

Data Type(s):    clinical data, survey data

Data Collection Notes:

This deposit is a new addition to the Midlife Development in the United States (MIDUS) Series

The title of this study was changed from Survey of Midlife Development in Japan (MIDJA): Biomarker Project, 2009-2010, to Survey of Midlife in Japan (MIDJA): Biomarker Project, 2009-2010, on May 9, 2017.


Sample:    There were two eligibility criteria for this second phase of the data collection: (1) completed the initial survey phase and (2) expressed interest in participating in the second, biomarker, phase by returning a post card to CRS as described above.

Weight:    None

Presence of Common Scales:    See the "Documentation of Scales and Constructed Variables in MIDJA Biomarker" available through the ICPSR and NACDA Web sites for complete information regarding the scales for the MIDJA Biomarker data collection.


Original ICPSR Release:   2014-07-03

Version History:

  • 2014-07-03 This is a subsample of the MIDJA Survey.

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