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

16378

Maximum birth year (loc_max_birth_yr)

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

Overview

Valid: 45

Mean: 28.51

var_std: 3.28

Range: -

Format: Numeric

Others

Notes

Field Note : for form A1
Calculated : sum([loc_currentyr]-15)

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