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

13136

2. Have you dropped many of your activities and interests? (loc_dropact)

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

Overview

Valid: 41

Mean: 79.72

var_std: 13.97

Range: -

Format: Numeric

Others

Notes

Calculated : if([dropact]<>"", if([dropact] = 9, 0,[dropact]), "")

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