Midlife in the U.S.
MIDUS is a national longitudinal study of how diverse factors interact to influence health and well-being as people age from early adulthood into midlife and old age. It was conceived by a multidisciplinary team of scholars interested in understanding aging as a bio-psycho-social integrative process.
Overview
- Acronym
- MIDUS
- Website
- MIDUS
- Investigators
-
- Contacts
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General Design
- Study design
- Cohort
- Start - End Year
- 1995 -
- Recruitment Target
-
- Individuals
- Families
- Number of Participants
- 8,727
- Number of Participants with Biological Samples
- 1,637
Access
Availability of data and biosamples
| Possible Access to Data | |
| Possible Access to Biosamples | |
| Other |
|
Timeline
Populations
Respondents were drawn from a nationally representative random-digit-dial sample of non-institutionalized, English-speaking adults, aged 25-74, selected from working telephone banks in the coterminous United States. It is comprised of individuals from four subsamples: (1) a national RDD (random digit dialing) sample (n=3,487); (2) oversamples from five metropolitan areas in the U.S. (n=757); (3) siblings of individuals from the RDD sample (n=950); and (4) a national RDD sample of twin pairs (n=1,914).
Selection Criteria
- Minimum age
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25
- Maximum age
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74
- Countries
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- United States of America
Sources of Recruitment
- General Population
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- Random digit dialing
- Specific Population
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- Other specific population : In addition to the general population: siblings of individuals from the RDD sample; a national RDD sample of twin pairs
Sample Size
- Number of Participants
- 7,108
- Number of Participants with Biological Samples
- 1,054
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MIDUS - MIDUS 1 Baseline survey |
|
1995 (January) | 1996 (January) | |
| 1 | MIDUS - MIDUS 1 Daily Stress Project (NSDE) |
|
1996 (March) | 1997 (April) | |
| 2 | MIDUS - M2 Cognitive project |
|
2004 (February) | 2006 (March) | |
| 3 | MIDUS - MIDUS 2 survey |
|
2004 (February) | 2006 (November) | |
| 4 | MIDUS - M2 Daily Stress Project |
|
|
2004 (April) | 2009 (April) |
| 5 | MIDUS - M2 Biomarker Project |
|
|
2004 (July) | 2009 (May) |
| 6 | MIDUS - M2 Neuroscience Project |
|
2004 (August) | 2009 (May) |
As a refinement to MIDLIFE DEVELOPMENT IN THE UNITED STATES (MIDUS 2), 2004-2006, a sample of African Americans from Milwaukee was included to examine health issues in minority populations. Areas of the city of Milwaukee, Wisconsin, were stratified according to the proportion of the population that were African American. Those areas with high concentrations were sampled at higher rates than areas with lower concentrations. Area probability sampling methods were used along with population counts from the 2000 United States Census to identify potential respondents. Field interviewers screened households to determine if they contained any African American adults. There was additional screening to achieve an appropriate age/gender distribution in a manner similar to what was done for the original MIDUS sample (NATIONAL SURVEY OF MIDLIFE DEVELOPMENT IN THE UNITED STATES (MIDUS), 1995-1996). Milwaukee respondents were interviewed in their homes using a Computer Assisted Personal Interview (CAPI) protocol and afterwards asked to complete a Self-Administered Questionnaire (SAQ). All measures paralleled those used in the larger MIDUS 1 and 2 samples. After successful completion of the Project 1 survey, some participants were eligible to participate in other MIDUS projects (2 through 5). Survey data was collected for 592 individuals.
Selection Criteria
- Minimum age
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35
- Maximum age
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85
- Countries
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- United States of America
- Territory
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Milwaukee, Wisconsin
- Ethnic Origin
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- African American
Sources of Recruitment
- General Population
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- Random digit dialing
Sample Size
- Number of Participants
- 592
- Number of Participants with Biological Samples
- 201
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MIDUS - Milwaukee African American - M2 Cognitive project |
|
2004 (February) | 2006 (March) | |
| 1 | MIDUS - Milwaukee African American - MIDUS 2 survey |
|
2004 (February) | 2006 (November) | |
| 2 | MIDUS - Milwaukee African American - M2 Daily Stress Project |
|
|
2004 (April) | 2009 (April) |
| 3 | MIDUS - Milwaukee African American - M2 Biomarker Project |
|
|
2004 (July) | 2009 (May) |
| 4 | MIDUS - Milwaukee African American - M2 Neuroscience Project |
|
2004 (August) | 2009 (May) |
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.
Selection Criteria
- Minimum age
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30
- Maximum age
-
79
- Countries
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- Japan
- Territory
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Tokyo
- Ethnic Origin
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- Japanese
Sources of Recruitment
- General Population
-
- Selected sample
Sample Size
- Number of Participants
- 1,027
- Number of Participants with Biological Samples
- 382
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MIDUS - Japan - MIDJA |
|
2008 (April) | 2008 (September) |
Participating Studies
| Acronym | Name | Study design | Countries |
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Harmonization Initiatives Included
| Acronym | Name |
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Datasets
| Name | Data Collection Events | Variables |
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Areas of Information Collected
- Socio-demographic and economic characteristics
- Death
- Lifestyle and behaviours
- Physical measures and assessments
- Birth, pregnancy and reproductive health history
- Laboratory measures
- Perception of health, quality of life, development and functional limitations
- Cognition, personality and psychological measures and assessments
- Diseases
- Life events, life plans, beliefs and values
- Symptoms and signs
- Preschool, school and work life
- Medication and supplements
- Social environment and relationships
- Non-pharmacological interventions
- Physical environment
- Health and community care services utilization
- Administrative information
Variables Content Summary
Areas of Information Collected
Areas of Information Collected per per Population and Data Collection Event
Networks
| Acronym | Name | Harmonization Initiatives | Individual Studies |
|---|