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

14737

1. Memory (memory)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Categories

Value	Category	Cases
0	None = 0 No memory loss, or slight inconsistent forgetfulnessNone = 0 No memory loss, or slight inconsistent forgetfulness	1	1.9%
0.5	Questionable = 0.5 Consistent slight forgetfulness; partial recollection of events; "benign" forgetfulnessQuestionable = 0.5 Consistent slight forgetfulness; partial recollection of events; "benign" forgetfulness	15	27.8%
1	Mild = 1 Moderate memory loss, more marked for recent events; defect interferes with everyday activitiesMild = 1 Moderate memory loss, more marked for recent events; defect interferes with everyday activities	4	7.4%
2	Moderate = 2 Severe memory loss; only highly learned material retained; new material rapidly lostModerate = 2 Severe memory loss; only highly learned material retained; new material rapidly lost	10	18.5%
3	Severe = 3 Severe memory loss; only fragments remainSevere = 3 Severe memory loss; only fragments remain	12	22.2%
99	Not ApplicableNot Applicable	12	22.2%

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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