Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. National Survey of Midlife Development in the United States (MIDUS II), 2004-2006 (ICPSR 4652) Ryff, Carol; Almeida, David M.; Ayanian, John; et al. 1 more result in Midlife Development in the United States (MIDUS) Series 2. Swedish Adoption/Twin Study on Aging (SATSA), 1984, 1987, 1990, 1993, 2004, 2007, and 2010 (ICPSR 3843) Pedersen, Nancy L.