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

15364

Study Description
Data Dictionary

20. Indicate the predominant domain that was first recognized as changed in the participant: (frstchg)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Question pretext

[decclmot] <> ''

Categories

Value	Category	Cases
0	Assessed at a previous UDS visit	11	20.4%
1	Cognition	15	27.8%
2	Behavior	7	13%
3	Motor function	7	13%
8	Not applicable	13	24.1%
9	Unknown	1	1.9%

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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