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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
12115

8b. Rapid alternating movement of hands - left hand (handaltl)

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 20
33.3%
1 Mild slowing and/or reduction in amplitude 10
16.7%
2 Moderately impaired; definite and early fatiguing; may have occasional arrests in movement 4
6.7%
3 Severely impaired; frequent hesitation in initiating movements or arrests in ongoing movement 14
23.3%
4 Can barely perform the task. 0
0%
8 Untestable 12
20%
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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