Study Search Results Your query returned 5 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. (?) Study Title/Investigator 1. Danish 1905 Cohort Study, 1998 (ICPSR 3960) University of Southern Denmark. Institute of Public Health; Duke University 2. Longitudinal Study of Aging Danish Twins, 1995 (ICPSR 21041) Christensen, Kaare; Vaupel, James W. 3. National Health Interview Survey, 2004 (ICPSR 4349) United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics 5 more results in National Health Interview Survey Series 4. National Survey of Self-Care and Aging: Follow-Up, 1994 (ICPSR 2592) DeFriese, Gordon H.; Norburn, Jean E. Kincade 5. World Health Organization Collaborative Study on Social and Health Aspects of Aging in Bahrain, Egypt, Jordan, and Tunisia, 1991 (ICPSR 6250) Andrews, Gary R.