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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
12169

(C2 Q18b/C2T Q16b) What makes this participant's responses less valid? (Select all that apply) (loc_res)

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

Overview

Valid: 57
Range: -
Format:

Questions and instructions

Question pretext
[respval]='2' or [respval]='3'
Categories
Value Category Cases
1 Hearing impairment 12
21.1%
2 Distractions 10
17.5%
3 Interruptions 7
12.3%
4 Lack of effort or disinterest 7
12.3%
5 Fatigue 6
10.5%
6 Emotional issues 5
8.8%
7 Unapproved assistance 6
10.5%
8 Other 4
7%
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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