Export as PDF
Cohort Acronym

Cohort type
General population-based cohort


Participant type
No diagnosis

Recruitment Period 1995-6 
Sample size at start or planned sample size if still recruiting 7108  
Estimated Current Sample Size  
Age at Recruitment 25-74   
Gender Male and Female 

The first wave of the MIDUS study collected survey data from a total of 7,108 participants. The baseline sample was 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).

All eligible participants were non-institutionalized, English-speaking adults in the coterminous United States, aged 25 to 74. Data from the above samples were collected primarily in 1995/96.

Last update – 03/02/2017

Country USA 
Contact details
Institution name UW-Madison Institute on Aging 
Principal Investiator (PI) Dr Carol Ryff 
Contact email [email protected] 
Contact phone number 608 262 1818 
Address Dr. Barry Radler, University of Wisconsin - Madison Institute on Aging, 1300 University Avenue, 2245 MSC, Madison, Wisconsin,53706-1532 
Funders (Core support) National Institute on Aging (NIA) 

Variables Collected

Brain related measures: Behaviour, Mental health, Neurological
Funtional rating: Individual psychological
Anthropometric: Blood pressure, Height, Hip circumference, Waist circumference, Weight
Physical: Cardiovascular, Musculoskeletal, Reproductive, Respiratory
Biological samples: Blood, Saliva, Urine
Genotyping: N/A
Brain imaging: Electroencephalogram (EEG), Magnetic resonance imaging (MRI)
Brain banking: N/A
Lifestyle: Physical activity, Smoking
Socio-economic: Education, Ethnic group, Family circumstances, Housing and accommodation, Income and finances, Informal support, Marital status, Occupation and employment, Unpaid care
Health service utilisation: Formal health and social care service utilisation including private care
Export as PDF