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

16187

Study Description
Data Dictionary

5. Cognitively impaired, not MCI reason (loc_impnomci)

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

Overview

Valid: 38

Range: -

Format:

Questions and instructions

Question pretext

[mci]='0'

Categories

Value	Category	Cases
1	Evidence of functional impairment (e.g.	11	28.9%
2	Cognitive testing is abnormal but no clinical concern or functional decline (e.g.	18	47.4%
3	Longstanding cognitive difficulties	9	23.7%
4	Other	0	0%

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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