Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. National Survey of Midlife Development in the United States (MIDUS Refresher), 2011-2014 (ICPSR 36532) Ryff, Carol; Almeida, David; Ayanian, John; et al. 2. Panel Study of Income Dynamics, 1968-1999: Supplemental Files (ICPSR 3202) Hofferth, Sandra; Stafford, Frank P.; Yeung, Wei-Jun J.; et al.