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

14785

Study Description
Data Dictionary

13. Overall mode of onset for behavioral symptoms {loc_bemode_lastvis} (bemode)

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

Overview

Valid: 54

Range: -

Format:

Questions and instructions

Question pretext

[decclbe] = '1'

Categories

Value	Category	Cases
1	Gradual	3	5.6%
2	Subacute	20	37%
3	Abrupt	11	20.4%
4	Other	9	16.7%
99	Unknown	11	20.4%

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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