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.
- Start Year
- 1995
Visit MIDUS
| Investigators | Contacts |
|---|---|
|
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Design
- Study design
- Cohort
- Follow Up
- Supplementary Information
Recruitment
- Recruitment Target
-
- Individuals
- Families
Number of Participants
- 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
-
25
- Maximum age
-
74
- Newborns
- Twins
- Countries
-
- United States of America
- Territory
- Ethnic Origin
-
- Health Status
-
- Other Criteria
- Supplementary Information about selection criteria
Recruitment
- Sources of recruitment
-
- General population
- Specific population
- General Population
-
- Random digit dialing
- Specific Population
-
- Other specific population : In addition to the general population: siblings of individuals from the RDD sample; a national RDD sample of twin pairs
Number of Participants
- Number of Participants
- 7,108
- Number of Participants with Biological Samples
- 1,054
- Supplementary Information about selection criteria
Data Collection Events
| # | Name | Description | Start | End |
|---|---|---|---|---|
| 0 |
MIDUS - MIDUS 1 Baseline survey
|
Computer-assisted telephone interview (CATI) and two self administered mail questionnaire. In addition, The twin subsample answered a short screening survey to assess zygosity ... |
1995-01 | 1996-01 |
| 1 |
MIDUS - MIDUS 1 Daily Stress Project (NSDE)
|
National Study of Daily Experiences (NSDE) by computer-assisted telephone interview. The sample is comprised of 1,031 random-digit dialed (RDD) respondents and 452 twins. The twin subsample ... |
1996-03 | 1997-04 |
| 2 |
MIDUS - M2 Cognitive project
|
Phone-Based Cognitive battery and a face to face assessment of cognitive capacities. |
2004-02 | 2006-03 |
| 3 |
MIDUS - MIDUS 2 survey
|
Computer-assisted telephone interview (CATI) and two self administered mail questionnaire. |
2004-02 | 2006-11 |
| 4 |
MIDUS - M2 Daily Stress Project
|
8 days of daily experience obtained via phone interview and 4 days of salivary cortisol. |
2004-04 | 2009-04 |
| 5 |
MIDUS - M2 Biomarker Project
|
Biomarker data collection during a 2-day clinic visit. The biomarkers reflect functioning of the hypothalamic-pituitary-adrenal axis, the autonomic nervous system, the ... |
2004-07 | 2009-05 |
| 6 |
MIDUS - M2 Neuroscience Project
|
Cognitive assessment test and self-enumerated questionnaire on affective reactivity and recovery. Presence of Common Scales: DPES- Dispositional Positive Emotion Scale; PANAS- ... |
2004-08 | 2009-05 |
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
-
35
- Maximum age
-
85
- Newborns
- Twins
- Countries
-
- United States of America
- Territory
-
Milwaukee, Wisconsin
- Ethnic Origin
-
- African American
- Health Status
-
Recruitment
- Sources of recruitment
-
- General population
- Specific population
- General Population
-
- Random digit dialing
Number of Participants
- Number of Participants
- 592
- Number of Participants with Biological Samples
- 201
Data Collection Events
| # | Name | Description | Start | End |
|---|---|---|---|---|
| 0 |
MIDUS - Milwaukee African American - M2 Cognitive project
|
Phone-Based Cognitive battery and a face to face assessment of cognitive capacities. |
2004-02 | 2006-03 |
| 1 |
MIDUS - Milwaukee African American - MIDUS 2 survey
|
Computer-assisted telephone interview (CATI) and two self administered mail questionnaire. |
2004-02 | 2006-11 |
| 2 |
MIDUS - Milwaukee African American - M2 Daily Stress Project
|
8 days of daily experience obtained via phone interview and 4 days of salivary cortisol. |
2004-04 | 2009-04 |
| 3 |
MIDUS - Milwaukee African American - M2 Biomarker Project
|
Biomarker data collection during a 2-day clinic visit. The biomarkers reflect functioning of the hypothalamic-pituitary-adrenal axis, the autonomic nervous system, the ... |
2004-07 | 2009-05 |
| 4 |
MIDUS - Milwaukee African American - M2 Neuroscience Project
|
Cognitive assessment test and self-enumerated questionnaire on affective reactivity and recovery. Presence of Common Scales: DPES- Dispositional Positive Emotion Scale; PANAS- ... |
2004-08 | 2009-05 |
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
-
30
- Maximum age
-
79
- Newborns
- Twins
- Countries
-
- Japan
- Territory
-
Tokyo
- Ethnic Origin
-
- Japanese
- Health Status
-
Recruitment
- Sources of recruitment
-
- General population
- General Population
-
- Selected sample
Number of Participants
- Number of Participants
- 1,027
- Number of Participants with Biological Samples
- 382
Data Collection Event
Survey of Midlife Development in Japan (MIDJA) survey using a mail and an self-enumerated questionnaire.
- Start Date
-
2008-04
- End Date
-
2008-09
- Data sources
-
- Questionnaires
Classifications
- Socio-demographic and economic characteristics
- Lifestyle and behaviours
- Birth, pregnancy and reproductive health history
- Perception of health, quality of life, development and functional limitations
- Diseases
- Symptoms and signs
- Medication and supplements
- Non-pharmacological interventions
- Health and community care services utilization
- Death
- Physical measures and assessments
- Laboratory measures
- Cognition, personality and psychological measures and assessments
- Life events, life plans, beliefs and values
- Preschool, school and work life
- Social environment and relationships
- Physical environment
- Administrative information
- Cognitive functioning
- Personality
- Psychological distress and emotions
- Other psychological measures and assessments
- Life events
- Beliefs and values
- Perception of health
- Quality of life
- Life course development
- Functional limitations
- Other perception of health, quality of life and functional limitation-related information
- Tobacco
- Alcohol
- Drugs
- Nutrition
- Breastfeeding
- Physical activity
- Sleep
- Sexual behaviours and orientation
- Technological devices
- Misbehaviour and criminality
- Other and unspecified lifestyle information
Socio-demographic and economic characteristics
Lifestyle and behaviours
Birth, pregnancy and reproductive health history
Perception of health, quality of life, development and functional limitations
Diseases
Symptoms and signs
Medication and supplements
Non-pharmacological interventions
Health and community care services utilization
Death
Physical measures and assessments
Laboratory measures
Cognition, personality and psychological measures and assessments
Life events, life plans, beliefs and values
Preschool, school and work life
Social environment and relationships
Physical environment
Administrative information
Cognitive functioning
Personality
Psychological distress and emotions
Other psychological measures and assessments
Life events
Beliefs and values
Quality of life
Functional limitations
Sleep