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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
13258

4h1. After a head injury, what was the longest period of time that the participant was unconscious? (headinjunc)

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

Overview

Valid: 58
Range: -
Format:

Questions and instructions

Question pretext
[headinjury]='1'
Categories
Value Category Cases
0 Less than 5 minutes 6
10.3%
1 5 minutes to less than 30 minutes 12
20.7%
2 30 minutes to less than 24 hours 9
15.5%
3 1 day to less than 7 days 9
15.5%
4 7 days or more 10
17.2%
8 Not applicable, no loss of consciousness 2
3.4%
9 Unknown duration 10
17.2%
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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