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

13465

Study Description
Data Dictionary

0d1. If 'A3 Participant Family History' form was completed remotely, specify reason (rmreasa3)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[modea3]='2'

Categories

Value	Category	Cases
1	Too cognitively impaired	13	23.2%
2	Too physically impaired	14	25%
3	Homebound or nursing home	13	23.2%
4	Refused in-person visit	4	7.1%
5	Other	12	21.4%

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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