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

12201

2b1. Sibling 2 -- Birth year (YYYY) (sib2yob)

Valid: 57

Mean: 42.00

var_std: 4.74

Range: -

Format: Numeric

Question pretext

[sibs]>1 and [sibs]<>"" and [sibs]<77

Notes

Field Note : [loc_6666_choice_instr:hideunderscore] 9999 = Unknown

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