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

15162

Study Description
Data Dictionary

(C2 Q1s/C2T Q1j) Abstraction (mocaabst)

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

Overview

Valid: 58

Range: -

Format:

Questions and instructions

Question pretext

[mocacomp]='1'

Categories

Value	Category	Cases
0	0	9	15.5%
1	1	7	12.1%
2	2	5	8.6%
95	95 = Physical problem	8	13.8%
96	96 = Cognitive/behavior problem	7	12.1%
97	97 = Other problem	7	12.1%
98	98 = Verbal refusal	15	25.9%

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