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

15950

Study Description
Data Dictionary

10a. Irritability/lability -- Is the patient impatient and cranky? Does he/she have difficulty coping with delays or waiting for planned activities? (irr)

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

Overview

Valid: 57

Range: -

Format:

Questions and instructions

Question pretext

[modeb5]<>'0'

Categories

Value	Category	Cases
1	Yes	4	7%
0	No	17	29.8%
9	Unknown	36	63.2%

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.

Back to Catalog