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

13881

Study Description
Data Dictionary

1. Speech (speech)

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

Overview

Valid: 55

Range: -

Format:

Questions and instructions

Question pretext

[pdnormal] <> '1'

Categories

Value	Category	Cases
0	Normal	23	41.8%
1	Slight loss of expression, diction and/or volume	1	1.8%
2	Monotone, slurred but understandable; moderately impaired.	2	3.6%
3	Marked impairment, difficult to understand	13	23.6%
4	Unintelligible	5	9.1%
8	Untestable	11	20%

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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