Seattle Longitudinal Study (SLS)
SLS began in 1956, and followed the participants every seven years. Over 6,000 people that were part of the Group Health Cooperative at the time of recruitment, have taken part in the SLS. At each wave, new participants were additionally recruited alongside participants being followed up. In the late 1900s, participants' siblings and adult children were interviewed, with grandchildren also responding in the early 2000s. A follow up study focused on the midlife of participants was funded from 2005 - 2015, called "Midlife Cognitive Change and Risk of Cognitive Decline". In the 1998 sweep, 719 participants were interviewed.
Study design
Cohort, Cohort - open, Cohort - intergenerational
Number of participants at first data collection
500 (participants)
Age at first data collection
25 - 67 years (participants)
Participant year of birth
Varied (participants)
Participant sex
All
Representative sample at baseline?
No
Sample features
Country
Year of first data collection
1956
Primary Institutions
Group Health Cooperative of Puget Sound (now known as Group Health Cooperative; GHC)
University of Washington (UW)
Profile paper DOI
Not available
Funders
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
National Institute on Aging (NIA)
Ongoing?
No
Data types collected
- Computer, paper or task testing (e.g. cognitive testing, theory of mind doll task, attention computer tasks)
- Interview – face-to-face
- Physical or biological assessment (e.g. blood, saliva, gait, grip strength, anthropometry)
- Secondary data
- Self-report questionnaire – paper or computer assisted
- None
- None
- Healthcare data
Engagement
Keywords
