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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
16040

(C2 Q6b/C2T Q5b) Longest span backward (digbacls)

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

Overview

Valid: 60
Range: -
Format:

Questions and instructions

Question pretext
[digbacct]<15 and [digbacct]<>""
Categories
Value Category Cases
0 0 11
18.3%
2 2 11
18.3%
3 3 3
5%
4 4 1
1.7%
5 5 15
25%
6 6 4
6.7%
7 7 4
6.7%
8 8 11
18.3%
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.

Others

Notes
Field Note : (0, 2-8)
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