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. Midlife Development in the United States (MIDUS): Psychological Experiences Follow-Up Study, 1998 (ICPSR 2911) Wethington, Elaine; Kessler, Ronald C.; Brim, Orville G. 2. National Survey of Midlife Development in the United States (MIDUS II), 2004-2006 (ICPSR 4652) Ryff, Carol; Almeida, David M.; Ayanian, John; et al.