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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
15921

(C2 Q18a/C2T Q16a) How valid do you think the participant's responses are? (respval)

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

Overview

Valid: 56
Range: -
Format:

Questions and instructions

Question pretext
[loc_c2_or_c2t]<>''
Categories
Value Category Cases
1 Very valid, probably accurate indication of participant's cognitive abilities 2
3.6%
2 Questionably valid, possibly inaccurate indication of participant's cognitive abilities 23
41.1%
3 Invalid, probably inaccurate indication of participant's cognitive abilities 31
55.4%
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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