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
14854
8a2. Number of correct lines (trailali)
Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Overview
Valid:
54
Range:
-
Format:
Questions and instructions
Question pretext
[traila]<151 and [traila]<>""
Categories
| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0 | 0 |
0%
|
| 1 | 1 | 0 |
0%
|
| 2 | 2 | 33 |
61.1%
|
| 3 | 3 | 0 |
0%
|
| 4 | 4 | 0 |
0%
|
| 5 | 5 | 0 |
0%
|
| 6 | 6 | 18 |
33.3%
|
| 7 | 7 | 0 |
0%
|
| 8 | 8 | 0 |
0%
|
| 9 | 9 | 3 |
5.6%
|
| 10 | 10 | 0 |
0%
|
| 11 | 11 | 0 |
0%
|
| 12 | 12 | 0 |
0%
|
| 13 | 13 | 0 |
0%
|
| 14 | 14 | 0 |
0%
|
| 15 | 15 | 0 |
0%
|
| 16 | 16 | 0 |
0%
|
| 17 | 17 | 0 |
0%
|
| 18 | 18 | 0 |
0%
|
| 19 | 19 | 0 |
0%
|
| 20 | 20 | 0 |
0%
|
| 21 | 21 | 0 |
0%
|
| 22 | 22 | 0 |
0%
|
| 23 | 23 | 0 |
0%
|
| 24 | 24 | 0 |
0%
|
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.
Others
Notes
Field Note : 0-24, always 24 unless they run out of time