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

14287

Study Description
Data Dictionary

0d1. If 'A5/D2 Participant Health History' form was completed remotely, specify reason (rmreasa5d2)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Question pretext

[modea5d2]='2'

Categories

Value	Category	Cases
1	Too cognitively impaired	16	29.6%
2	Too physically impaired	9	16.7%
3	Homebound or nursing home	2	3.7%
4	Refused in-person visit	8	14.8%
5	Other	19	35.2%

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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