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

14183

Study Description
Data Dictionary

4b. Action or postural tremor of hands - left hand (tractlhd)

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

Overview

Valid: 57

Range: -

Format:

Questions and instructions

Question pretext

[pdnormal] <> '1'

Categories

Value	Category	Cases
0	Absent	2	3.5%
1	Slight; present with action	13	22.8%
2	Moderate in amplitude, present with action	11	19.3%
3	Moderate in amplitude with posture holding as well as action	8	14%
4	Marked in amplitude; interferes with feeding	10	17.5%
8	Untestable	13	22.8%

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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