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

13148

Study Description
Data Dictionary

4h3. Total number of head injuries in which the participant felt "dazed or confused", unable to recall details of the injury or experienced loss of consciousness? (headinjnum)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[headinjury]='1'

Categories

Value	Category	Cases
0	None	6	10.7%
1	1-2	13	23.2%
2	3-5	7	12.5%
3	6-12	14	25%
4	13 or more	13	23.2%
9	Unknown	3	5.4%

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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