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

14692

3c1. Child 3 -- Birth year (YYYY) (kid3yob)

Valid: 56

Mean: 64.82

var_std: 6.20

Range: -

Format: Numeric

Question pretext

[kids]>2 and [kids]<>""

Notes

Field Note : [loc_666_choice_instr:hideunderscore] 9999 = Unknown

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