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

13915

Study Description
Data Dictionary

23. How often do you have contact with close friends either in person, by phone, mail, or email (e.g., any online interaction)? (friendcomm)

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

Overview

Valid: 60

Range: -

Format:

Questions and instructions

Question pretext

[modea1a] <> '0'

Categories

Value	Category	Cases
0	Do not have close friends	11	18.3%
1	Once a year or less	19	31.7%
2	Several times a year	10	16.7%
3	Several times a month	2	3.3%
4	Several times a week	14	23.3%
5	Everyday or almost everyday	1	1.7%
8	Prefer not to answer	3	5%

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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