Home / Central Data Catalog / USDV4 / variable [packet]
central

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
11480

Packet Code (packet)

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

Overview

Valid: 57
Range: -
Format:

Questions and instructions

Categories
Value Category Cases
I Initial Visit Packet - for newly enrolled participants 6
10.5%
I4 Initial UDSv4 Visit Packet - for participants who had previous UDS data and are completing UDSv4 for the first time 14
24.6%
F Follow-up Visit Packet 37
64.9%
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