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

14342

Study Description
Data Dictionary

6d3. Consistent with LBD (tracerlbd)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[tracothdx]='1' or [tracothdx]='2'

Categories

Value	Category	Cases
0	No, inconsistent	12	21.4%
1	Yes, consistent	18	32.1%
9	Indeterminate	11	19.6%
8	Not assessed	15	26.8%

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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