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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
11740

13. Posture stability (posstab)

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

Overview

Valid: 60
Range: -
Format:

Questions and instructions

Question pretext
[pdnormal] <> '1'
Categories
Value Category Cases
0 Normal erect 13
21.7%
1 Retropulsion, but recovers unaided. 11
18.3%
2 Absence of posturnal response; would fall if not caught by examiner. 20
33.3%
3 Very unstable, tends to lose balance spontaneously. 5
8.3%
4 Unable to stand without assistance. 7
11.7%
8 Untestable 4
6.7%
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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