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

15239

Study Description
Data Dictionary

8a. Consistent with AD (biomad1)

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

Overview

Valid: 57

Range: -

Format:

Questions and instructions

Question pretext

[othbiom1]='1' or [othbiom1]='2'

Categories

Value	Category	Cases
0	No, inconsistent	19	33.3%
1	Yes, consistent	12	21.1%
9	Indeterminate	14	24.6%
8	Not assessed	12	21.1%

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.

Back to Catalog