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

12645

2t1. Sibling 20 -- Birth year (YYYY) (sib20yob)

Valid: 60

Mean: 87.33

var_std: 4.67

Range: -

Format: Numeric

Question pretext

[sibs]>19 and [sibs]<>"" and [sibs]<77

Notes

Field Note : [loc_666_choice_instr:hideunderscore] 9999 = Unknown

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