Survey of Midlife in Japan (MIDJA 2), May-October 2012

In 2008, with funding from the National Institute on Aging (NIA), baseline survey data for the Survey of Midlife in Japan (MIDJA), April-September 2008 were collected from a probability sample of Japanese adults (N=1,027) aged 30 to 79 from the Tokyo metropolitan area (ICPSR 30822). In 2009-2010 biomarker data was obtained from a subset of these cases (ICPSR 34969).
The survey and biomarker measures obtained parallel those in a national longitudinal sample of Americans known as Midlife in the United States or MIDUS (ICPSR 2760: MIDUS 1 and ICPSR 4652: MIDUS 2). The central objective was to compare the Japanese sample (MIDJA) with the United States sample (MIDUS) to test hypotheses about the role of psychosocial factors in the health (broadly defined) of mid- and later-life adults in Japan and the United States.
In 2012, with additional support from NIA, a longitudinal follow-up of the MIDJA sample was completed. The data collection for this second wave (N=657) largely repeated the baseline assessments. The goal of the follow-up wave was to conduct comparisons of longitudinal data available from the Japanese sample (MIDJA) and the United States sample (MIDUS) to test the hypothesis about the role of psychosocial factors in predicting health changes (including biomarkers) in both cultural contexts. Cultural influences on age differences in health and well-being were also of interest.
Demographic and background information included gender, age, education, marital status, household composition, and income.

2008年，在美国国家衰老研究所（National Institute on Aging, NIA）资助下，《2008年4-9月日本中年调查（Survey of Midlife in Japan, MIDJA）》的基线调查数据从东京都地区30-79岁的日本成年人概率样本中收集（样本量N=1027，ICPSR 30822）。2009-2010年，从这些案例的子集中获取了生物标志物数据（ICPSR 34969）。
本调查及生物标志物测量与美国全国纵向样本（即美国中年调查，Midlife in the United States, MIDUS）的相关内容相似（ICPSR 2760：MIDUS 1；ICPSR 4652：MIDUS 2）。核心目标是比较日本样本（MIDJA）与美国样本（MIDUS），以检验心理社会因素在日美两国中老年人（广义定义）健康中作用的假设。
2012年，在NIA的额外支持下，完成了MIDJA样本的纵向随访。第二波数据收集（N=657）基本重复了基线评估内容。随访波的目标是比较日美两国样本（MIDJA与MIDUS）的纵向数据，以检验心理社会因素在两种文化背景下预测健康变化（包括生物标志物）作用的假设。文化对健康与福祉年龄差异的影响也是研究关注点之一。
人口统计学及背景信息包括性别、年龄、教育程度、婚姻状况、家庭构成和收入。