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
15703
2p4. Sibling 16 -- Secondary dx (sib16etsec)
Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Overview
Valid:
57
Range:
-
Format:
Questions and instructions
Question pretext
[sibs]>15 and [sibs]<>"" and [sibs]<77
Categories
| Value | Category | Cases | |
|---|---|---|---|
| 00 | No known neurological/psychiatric diagnosis | 5 |
8.8%
|
| 01 | Alzheimer's Disease | 8 |
14%
|
| 02 | Lewy Body dementia (includes DLB and PDD) | 2 |
3.5%
|
| 03 | Vascular dementia | 6 |
10.5%
|
| 04 | Stroke | 7 |
12.3%
|
| 05 | FTLD* without motor neuron disease | 5 |
8.8%
|
| 06 | FTLD* with motor neuron disease | 6 |
10.5%
|
| 07 | Motor Neuron Disease | 5 |
8.8%
|
| 08 | Parkinson's Disease | 0 |
0%
|
| 09 | Prion pathology | 2 |
3.5%
|
| 10 | Psychiatric condition | 4 |
7%
|
| 11 | Dementia of unknown etiology | 0 |
0%
|
| 12 | Other | 0 |
0%
|
| 66 | Provided at previous visit | 1 |
1.8%
|
| 88 | No secondary diagnosis | 3 |
5.3%
|
| 99 | Specific diagnosis unknown (acceptable if method of evaluation is not by exam or autopsy) | 3 |
5.3%
|
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.