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

14971

Study Description
Data Dictionary

12a. Nighttime behaviors -- Does the patient awaken you during the night, rise too early in the morning, or take excessive naps during the day? (nite)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[modeb5]<>'0'

Categories

Value	Category	Cases
1	Yes	24	42.9%
0	No	21	37.5%
9	Unknown	11	19.6%

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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