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

15405

Study Description
Data Dictionary

4. In the past 30 days, how often did you worry about whether or not you would be able to get somewhere because of a problem with transportation? (transworry)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Question pretext

[modea1a] <> '0'

Categories

Value	Category	Cases
1	Often	12	22.2%
2	Sometimes	18	33.3%
3	Never	1	1.9%
8	Prefer not to answer	23	42.6%

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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