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

12772

Study Description
Data Dictionary

ADRC Visit Number (visitnum)

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

Overview

Valid: 58

Range: -

Format: character

Others

Notes

Field Note : The Center may use its existing visit number scheme. It is not required to start with 1. If submitting a UDSv4 initial visit packet or a follow-up visit packet for an existing participant, please continue with the next sequential visit number for this participant; do not restart visit numbers.

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