Midlife in the United States (MIDUS Refresher): Biomarker Project, 2012-2016 (ICPSR 36901)
Version Date: Jun 11, 2018 View help for published
Version V2 (see more versions)
Summary View help for Summary
These data are being released in BETA version to facilitate early access to the study for research purposes. This collection has not been fully processed by NACDA or ICPSR at this time; the original materials provided by the principal investigator were minimally processed and converted to other file types for ease of use. As the study is further processed and given enhanced features by ICPSR, users will be able to access the updated versions of the study. Please report any data errors or problems to user support and we will work with you to resolve any data related issues.
The MIDUS Refresher study Survey (2011-2014 ICPSR 36532) recruited a national probability sample of 3,577 adults, aged 25 to 74, designed to replenish the original MIDUS 1 baseline cohort and paralleling the five decadal age groups of the MIDUS 1 baseline survey (ICPSR 2760). The MIDUS Refresher survey employed the same comprehensive assessments as those assembled on the core longitudinal MIDUS sample, but with additional questions about impacts of the economic recession of 2008-09. The MIDUS Refresher Biomarker study (2012-2016) obtained data from 863 respondents (n=746 Main sample, n=117 African Americans from Milwaukee) who completed the MIDUS Refresher Survey.
The purpose of the Refresher Biomarker Project (Project 4) parallels that of the MIDUS 2 Biomarker project (ICPSR 29282), which collected comprehensive biological assessments on a subsample of MIDUS respondents, thus facilitating analyses that integrate behavioral and psychosocial factors with biological regulation/dysregulation, broadly defined. The aim was to use such data to explicate biopsychosocial pathways that contributed to diverse health outcomes. A further theme was to examine period effects on health (mental and physical) related to the economic recession by comparing the pre-recession MIDUS sample with the post-recession MIDUS Refresher sample. A further objective of the MIDUS Refresher sample was to strengthen cross-project analyses by increasing the sample sizes available for testing hypotheses regarding the interplay of key factors (e.g., socioeconomic status, gender, psychosocial factors, biological factors) in mid- and later-life health.
Biomarker data collection was carried out at hypothalamic-pituitary-adrenal axis, the autonomic nervous system, the immune system, cardiovascular system, musculoskeletal system, antioxidants, and three General Clinical Research Centers (at UCLA, University of Wisconsin, and Georgetown University). The biomarkers reflect functioning of the metabolic processes. Our specimens (fasting blood draw, 12-hour urine, saliva) allowed for assessment of multiple indicators within these major systems. The protocol also included assessments by clinicians or trained staff, including vital signs, morphology, functional capacities including 3 dimensional gait analysis, bone densitometry, body composition, ankle brachial index, medication usage, and a physical exam. Project staff obtained indicators of heart-rate variability, beat to beat blood pressure, respiration, and salivary cortisol assessments during an experimental protocol that included both a cognitive and orthostatic challenge. Finally, to augment the self-reported data collected in Survey (Project 1), participants completed a medical history, self-administered questionnaire, and self-reported sleep assessments. For respondents at one site (UW-Madison), objective sleep assessments were also obtained with an Actiwatch(R) activity monitor.
Citation View help for Citation
Funding View help for Funding
Subject Terms View help for Subject Terms
Geographic Coverage View help for Geographic Coverage
Smallest Geographic Unit View help for Smallest Geographic Unit
None, except for respondents included in the Milwaukee sample
Distributor(s) View help for Distributor(s)
Time Period(s) View help for Time Period(s)
Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
The MIDUS-produced DDI codebook (PDF file) and the XML file (contained in a .zip package) were not changed in any way by ICPSR. These original files do not reflect any of the processing done by ICPSR.For more information on the MIDUS Refresher Project, please see the MIDUS web site.
Study Purpose View help for Study Purpose
The Biomarker Project is one of 5 projects comprising the MIDUS Refresher "Integrative Pathways to Health and Illness". The overarching objective of MIDUS is to investigate linkages between sociodemographic, psychosocial, and biological variables to account for later life profiles of morbidity and mortality. The MIDUS Refresher allows for expansion of the Biomarker sample to facilitate analyses that pay attention simultaneously to age, gender, and socioeconomic variation in how psychosocial and biological variables are linked. In addition, the Refresher sample will permit assessment of the impact of the ongoing economic recession on the health of diverse-aged adults via comparison with the extant Biomarker data from the MIDUS 2 sample. It will also lay the foundation for parallel longitudinal studies of same-aged adults from different birth cohorts on whom unfolding health trajectories are studied as the product of interacting domains of influence (biological, psychological, social) in a changing historical context (economic recession).
The Refresher Biomarker Project (P4) supported this goal primarily through assessment of a variety of biological indicators of physiology and health according to the basic protocol implemented at MIDUS 2. The protocol also included assessments of additional aspects of psychosocial experience. Modifications to that basic protocol and psychosocial assessments are noted below as appropriate. Data was collected during a 24 hour stay at one of 3 Clinical Research Units (CRU).
Study Design View help for Study Design
All biomarker assessments, with the exception of sleep assessments, were completed during the overnight stay at the regional CRU. The protocol for the visit was standardized across the three sites so that assessments were completed as follows:
Day 1 (late afternoon or evening of the day the person arrived at the CRU):
- Medication Chart
- Medical History
- Self-Administered Questionnaire (SAQ)
- Pittsburgh Sleep Questionnaire (PSQ)
- Physical Exam (Vitals)
- 12 hour Urine Collection began
Day 2 (the morning of the day the person left the CRU):
- 12 hour Urine Collection ended
- Fasting Blood Draw
- Psychophysiolgy Experimental Protocol
- Physical Exam (Functional Assessments)
Additional information regarding study design can be found in the Biomarker Project Summary documentation.
Sample View help for Sample
All respondents who completed the MIDUS Refresher Survey (Phone Interview and SAQs) were eligible to participate in the Refresher Biomarker project.
Time Method View help for Time Method
Universe View help for Universe
Non-institutionalized English-speaking adults in the United States.
Unit(s) of Observation View help for Unit(s) of Observation
Data Type(s) View help for Data Type(s)
Mode of Data Collection View help for Mode of Data Collection
Description of Variables View help for Description of Variables
DS 1: The aggregate dataset is comprised of survey data: self-administered questionnaires, staff administered interviews), as well as physical exam, medication, functional, physiological and assay data. The file contains 3,187 variables for 863 cases from the MIDUS Refresher MainRDD and Milwaukee African American samples.
DS 2: The Medication dataset is comprised of data about medications taken by MIDUS 2 Biomarker cases. The file contains data about 7,174 medications. The file contains 116 variables for 5,118 cases.
Response Rates View help for Response Rates
The Refresher Biomarker sample is comprised of respondents who completed the Refresher Survey phone or CAPI (Computer-Assisted Personal) interview and SAQs (Self-Administered Questionnaires). The response rate for eligible respondents (N=2625) is 32.9% (n=863). We were unable to locate or contact some eligible respondents, the response rate adjusted for these respondents is 41.5% (863/2080).
Presence of Common Scales View help for Presence of Common Scales
Additional information regarding scales can be found in the Psychosocial Constructs and Composite Variables documentation.
Original Release Date View help for Original Release Date
Version History View help for Version History
2018-06-11 This collection was updated to include revised versions of the Musculoskeletal Health and Function Data Documentation, Blood, Urine, and Saliva Data Documentation, and Readme file documentation. Additionally, this update included a second dataset and an associated codebook.2018-02-15 The citation of this study may have changed due to the new version control system that has been implemented. The previous citation was:
- Weinstein, Maxine, Carol D. Ryff, and Teresa E. Seeman. Midlife in the United States (MIDUS Refresher): Biomarker Project, 2012-2016. ICPSR36901-v2. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2018-06-11. http://doi.org/10.3886/ICPSR36901.v2
2017-12-21 ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
- Performed consistency checks.
- Checked for undocumented or out-of-range codes.
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.
This study is maintained and distributed by the National Archive of Computerized Data on Aging (NACDA), the aging program within ICPSR. NACDA is sponsored by the National Institute on Aging (NIA) at the National Institutes of Heath (NIH).