Journal
NEUROLOGY
Volume 67, Issue 8, Pages 1377-1382Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1212/01.wnl.0000240061.51215.ed
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Funding
- NIA NIH HHS [AG-08549] Funding Source: Medline
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Objective: To examine the effect of occupational characteristics on cognitive status change in members of the NAS-NRC Twins Registry of World War II veterans. Methods: Participants completed the modified Telephone Interview for Cognitive Status (TICS- m) on three occasions spanning a period of approximately 7 years. Based on factor analysis, occupational characteristics were interpreted as reflecting general intellectual demands (GI), human interaction and communication (HC), physical exertion (PE), and visual attention (VA). Results: Based on regression analysis of TICS-m change that was dependent on twin pairing and additionally covarying for education, age at each testing event, medical conditions, and initial TICS-m score, higher GI was associated with a modest longitudinal improvement in TICS-m performance, whereas higher PE and VA were both associated with a modest decline. Subsequent analysis revealed that these significant effects were present among dizygotic twins, but not among monozygotic twins. Conclusions: Previous findings of a relationship between occupational characteristics and cognitive performance in later life may be partially explained by genetic factors; however, until these genes are identified, occupational characteristics may be useful markers.
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