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

13370

Study Description
Data Dictionary

(C2 Q1o/C2T Q1f) Attention -- Letter A (mocalett)

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

Overview

Valid: 56

Range: -

Format:

Questions and instructions

Question pretext

[mocacomp]='1'

Categories

Value	Category	Cases
0	0	13	23.2%
1	1	1	1.8%
95	95 = Physical problem	8	14.3%
96	96 = Cognitive/behavior problem	5	8.9%
97	97 = Other problem	16	28.6%
98	98 = Verbal refusal	13	23.2%

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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