Women's Health Initiative Observational Study (WHI OS)
The WHI OS was established to explore the predictors and natural history of important causes of morbidity and mortality in postmenopausal women, and to serve as a secular control for the WHI Clinical Trial (CT). It enrolled over 93,000 postmenopausal women between the ages of 50 to 79 years at 40 clinical centres across the United States of America. Baseline assessment was conducted from 1994 to 1998. Participants were followed up annually for 8 to 12 years, including in-person clinical assessments and mailed questionnaires.
Study design
Cohort
Number of participants at first data collection
93,676 (participants)
Age at first data collection
50 - 79 years (participants)
Participant year of birth
Varied (participants)
Participant sex
Female
Representative sample at baseline?
No
Sample features
Country
Year of first data collection
1994
Primary Institutions
Fred Hutch Cancer Center
National Heart, Lung, and Blood Institute (NHLBI)
Profile paper DOI
Funders
National Heart, Lung, and Blood Institute (NHLBI)
National Institutes of Health (NIH)
Ongoing?
No
Data types collected
- Interview – face-to-face
- Interview – phone
- Physical or biological assessment (e.g. blood, saliva, gait, grip strength, anthropometry)
- Self-report questionnaire – paper or computer assisted
- None
- None
- None
Engagement
Keywords
