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

13870

Study Description
Data Dictionary

6b. Finger taps - left hand (tapslf)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Question pretext

[pdnormal] <> '1'

Categories

Value	Category	Cases
0	Normal	4	7.4%
1	Mild slowing and/or reduction in amplitude	2	3.7%
2	Moderately impaired; definite and early fatiguing; may have occasional arrests in movement	12	22.2%
3	Severely impaired; frequent hesitation in initiating movements or arrests in ongoing movement	15	27.8%
4	Can barely perform the task.	7	13%
8	Untestable	14	25.9%

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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