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

15752

Total number of questions with the answer 'Did not answer' (loc_tot_unanswered)

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

Overview

Valid: 43

Mean: 76.72

var_std: 19.15

Range: -

Format: Numeric

Others

Notes

Calculated : if(([loc_satis_2]<>"" and [loc_dropact_2]<>"" and [loc_empty_2]<>"" and [loc_bored_2]<>"" and [loc_spirits_2]<>"" and [loc_afraid_2]<>"" and [loc_happy_2]<>"" and [loc_helpless_2]<>"" and [loc_stayhome_2]<>"" and [loc_memprob_2]<>"" and [loc_wondrful_2]<>"" and [loc_wrthless_2]<>"" and [loc_energy_2]<>"" and [loc_hopeless_2]<>"" and [loc_better_2]), sum([loc_satis_2], [loc_dropact_2], [loc_empty_2], [loc_bored_2], [loc_spirits_2], [loc_afraid_2], [loc_happy_2], [loc_helpless_2], [loc_stayhome_2], [loc_memprob_2], [loc_wondrful_2], [loc_wrthless_2], [loc_energy_2], [loc_hopeless_2], [loc_better_2]), "")

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