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

12731

Study Description
Data Dictionary

0d1. If 'A1 Participant Demographics' form was completed remotely, specify reason (rmreasa1)

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

Overview

Valid: 57

Range: -

Format:

Questions and instructions

Question pretext

[modea1]='2'

Categories

Value	Category	Cases
1	Too cognitively impaired	9	15.8%
2	Too physically impaired	20	35.1%
3	Homebound or nursing home	11	19.3%
4	Refused in-person visit	11	19.3%
5	Other	6	10.5%

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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