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

13061

Study Description
Data Dictionary

15f. Change in facial expression - Has the participant's facial expression changed or become more "wooden," or masked and unexpressive? (moface)

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

Overview

Valid: 59

Range: -

Format:

Questions and instructions

Question pretext

[decclmot] = '1'

Categories

Value	Category	Cases
0	No	12	20.3%
1	Yes	20	33.9%
9	Unknown	27	45.8%

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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