Study Search Results Your query returned 2 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded Variable Relevance (?) Study Title/Investigator 1. Status of Older Persons in Economic Commission for Europe (ECE) Countries, Census Microdata Samples: Turkey, 1990 (ICPSR 3292) United Nations Economic Commission for Europe. Population Activities Unit 7 more results in Status of Older Persons in Economic Commission for Europe (ECE) Countries, Census Microdata Samples Series 2. ACTIVE (Advanced Cognitive Training for Independent and Vital Elderly), 1999-2001 [United States] (ICPSR 4248) Tennstedt, Sharon; Morris, John; Unverzagt, Frederick; et al.