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

15020

Study Description
Data Dictionary

7. Keeping track of current events (events)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[modeb7]<>'0'

Categories

Value	Category	Cases
8	Not applicable (e.g., never did)	9	16.1%
0	Normal	10	17.9%
1	Has difficulty, but does by self	22	39.3%
2	Requires assistance	9	16.1%
3	Dependent	1	1.8%
9	Unknown	5	8.9%

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.

Back to Catalog