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

15897

Study Description
Data Dictionary

Sum of D1a Diagnoses 10-32 marked as primary (loc_d1a_condall)

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

Overview

Valid: 50

Mean: 16.30

var_std: 0.51

Range: -

Format: Numeric

Others

Notes

Calculated : sum([loc_majdepdif],[loc_othdepdif],[loc_bipoldif],[loc_schizoif],[loc_anxietif],[loc_ptsddxif],[loc_ndevdisif],[loc_delirif],[loc_othpsyif], [loc_tbidxif],[loc_epilepif],[loc_hycephif],[loc_neopif],[loc_hivif],[loc_postc19if],[loc_apneadxif],[loc_othcillif], [loc_alcdemif],[loc_impsubif],[loc_medsif],[loc_cogothif],[loc_cogoth2f],[loc_cogoth3f])

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