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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
15252

0d1. If 'A2 Co-Participant Demographics' form was completed remotely, specify reason (rmreasa2)

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

Overview

Valid: 55
Range: -
Format:

Questions and instructions

Question pretext
[modea2]='2'
Categories
Value Category Cases
1 Too cognitively impaired 11
20%
2 Too physically impaired 1
1.8%
3 Homebound or nursing home 11
20%
4 Refused in-person visit 13
23.6%
5 Other 19
34.5%
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.
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