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

15016

Study Description
Data Dictionary

7. CDR Sum of Boxes (cdrsum)

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

Overview

Valid: 57

Mean: 74.00

var_std: 18.81

Range: -

Format: Numeric

Others

Notes

Calculated : if([loc_dssub]='1', '99', if( ([memory] = '' or [orient] = '' or [judgment] = '' or [commun] = '' or [homehobb] = '' or [perscare] = '' ), '', if( ([memory] = '99' or [orient] = '99' or [judgment] = '99' or [commun] = '99' or [homehobb] = '99' or [perscare] = '99' ), '99', sum([memory],[orient],[judgment],[commun],[homehobb],[perscare]) )))

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