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

16012

(C2 Q17a/C2T Q15a.) Per the clinician (e.g., neuropsychologist, behavioral neurologist, or other suitably qualified clinician), based on the UDS neuropsychological examination, the participant's cognitive status is deemed: (cogstat)

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

Overview

Valid: 55

Range: -

Format:

Questions and instructions

Question pretext

[loc_c2_or_c2t]<>''

Categories

Value	Category	Cases
1	Better than normal for age	6	10.9%
2	Normal for age	16	29.1%
3	One or two test scores are abnormal	16	29.1%
4	Three or more scores are abnormal or lower than expected	14	25.5%
0	Clinician unable to render opinion	3	5.5%

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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