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