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

14298

Study Description
Data Dictionary

6b. FDG PET - Was FDG PET data or information used to support an etiological diagnosis? (fdgpetdx)

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

Overview

Valid: 59

Range: -

Format:

Questions and instructions

Question pretext

[imagingdx]='1' or [imagingdx]='3'

Categories

Value	Category	Cases
0	No	20	33.9%
1	Yes, results were normal or abnormal	8	13.6%
2	Yes, results were indeterminate	31	52.5%

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.

Back to Catalog