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
Created on
Jul 02, 2026
Last modified
Jul 07, 2026
Page views
15202
2b4. Sibling 2 - Secondary dx (sib2etsec)
Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Overview
Valid:
58
Range:
-
Format:
Questions and instructions
Question pretext
[sibs]>1 and [sibs]<>"" and [sibs]<77
Categories
| Value | Category | Cases | |
|---|---|---|---|
| 00 | No known neurological/psychiatric diagnosis | 4 |
6.9%
|
| 01 | Alzheimer's Disease | 5 |
8.6%
|
| 02 | Lewy Body dementia (includes DLB and PDD) | 3 |
5.2%
|
| 03 | Vascular dementia | 4 |
6.9%
|
| 04 | Stroke | 8 |
13.8%
|
| 05 | FTLD* without motor neuron disease | 2 |
3.4%
|
| 06 | FTLD* with motor neuron disease | 7 |
12.1%
|
| 07 | Motor Neuron Disease | 3 |
5.2%
|
| 08 | Parkinson's Disease | 5 |
8.6%
|
| 09 | Prion pathology | 2 |
3.4%
|
| 10 | Psychiatric condition | 3 |
5.2%
|
| 11 | Dementia of unknown etiology | 0 |
0%
|
| 12 | Other | 3 |
5.2%
|
| 66 | Provided at previous visit | 3 |
5.2%
|
| 88 | No secondary diagnosis | 0 |
0%
|
| 99 | Specific diagnosis unknown (acceptable if method of evaluation is not by exam or autopsy) | 6 |
10.3%
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.