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

15777

Study Description
Data Dictionary

1j. In the past 12 months, how often has the participant consumed cannabis (edibles, smoked, or vaporized)? (cannabis)

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

Overview

Valid: 55

Range: -

Format:

Questions and instructions

Categories

Value	Category	Cases
0	Never	5	9.1%
1	Monthly or less	11	20%
2	2-4 times a month	11	20%
3	2-3 times a week	9	16.4%
4	4 or more times a week	6	10.9%
9	Unknown	13	23.6%

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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