Iowa Longitudinal Study (ILS)
The ILS investigated the phenomenology and classification of schizophrenia by examining various clinical and sociodemographic factors. The study began in 1987 and included approximately 500 first-episode schizophrenia patients, recruited from admissions to the University of Iowa Psychiatry Inpatient Service, in the United States of America. Patients were followed up at 6-month intervals, with MRI scans repeated at follow-up assessments after 2, 5, and 9 years, and every 3 years thereafter.
Study design
Cohort, Cohort - clinical
Number of participants at first data collection
542 (participants)
Age at first data collection
< 35 years (participants)
Participant year of birth
Varied (participants)
Participant sex
All
Representative sample at baseline?
No
Sample features
Country
Year of first data collection
1987
Primary Institutions
University of Iowa
Profile paper DOI
Funders
National Institutes of Health (NIH)
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
- Secondary data
- None
- Functional magnetic resonance imaging (fMRI)
- Magnetic Resonance Imaging (MRI)
- Healthcare data
Engagement
Keywords
