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

12638

2e1. Sibling 5 -- Birth year (YYYY) (sib5yob)

Valid: 54

Mean: 32.55

var_std: 1.71

Range: -

Format: Numeric

Question pretext

[sibs]>4 and [sibs]<>"" and [sibs]<77

Notes

Field Note : [loc_666_choice_instr:hideunderscore] 9999=unknown

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