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Uniform Data Set version 4
UDSv4 - Template

United States
Reference ID
USDv4
Producer(s)
National Alzheimer’s Coordinating Center (NACC) and the NIA-funded ADRC network
Collections
Clinical Trial
Metadata
DDI/XML JSON
Created on
Jul 02, 2026
Last modified
Jul 07, 2026
Page views
13183

6a. Tracer-based PET - Were tracer-based PET measures used in assessing an etiological diagnosis? (petdx)

Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml

Overview

Valid: 58
Range: -
Format:

Questions and instructions

Question pretext
[biomarkdx]='1' and ([imagingdx]='1' or [imagingdx]='3')
Categories
Value Category Cases
0 No 24
41.4%
1 Yes, results were normal or abnormal 10
17.2%
2 Yes, results were indeterminate 24
41.4%
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
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