Uniform Data Set version 4
UDSv4 - Template

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

11876

(C2 Q11i/C2T Q12i) Total number of non-F/L words and rule violation errors (udsverti)

Valid: 57

Mean: 75.97

var_std: 15.49

Range: -

Format: Numeric

Question pretext

[udsvernf]<>'' and [udsverln]<>''

Notes

Calculated : if(([udsvernf]<>'' and [udsverln]<>''), sum([udsvernf],[udsverln]),'')

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