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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
13117

5i1. Typical use of breathing machine (e.g. CPAP) at night over the past 12 months (cpap)

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

Overview

Valid: 56
Range: -
Format:

Questions and instructions

Question pretext
[apnea]='1'
Categories
Value Category Cases
0 None 14
25%
1 < 4 hours per night 17
30.4%
2 > 4 hours per night 17
30.4%
9 Unknown 8
14.3%
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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