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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
14942

9g. Fluctuating cognition - Does the participant exhibit pronounced variation in attention and alertness, noticeably over hours or days-for example, long lapses or periods of staring into space, or times when their ideas have a disorganized flow? (cogfluc)

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

Overview

Valid: 55
Range: -
Format:

Questions and instructions

Question pretext
[decclcog] = '1'
Categories
Value Category Cases
0 No 10
18.2%
1 Yes 11
20%
9 Unknown 34
61.8%
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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