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
11959
1a. Participant's month of birth (birthmo)
Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Overview
Valid:
55
Range:
-
Format:
Questions and instructions
Question pretext
[packet]='I' OR [packet]='I4'
Categories
| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 - January | 7 |
12.7%
|
| 2 | 2 - February | 8 |
14.5%
|
| 3 | 3 - March | 7 |
12.7%
|
| 4 | 4 - April | 3 |
5.5%
|
| 5 | 5 - May | 1 |
1.8%
|
| 6 | 6 - June | 3 |
5.5%
|
| 7 | 7 - July | 3 |
5.5%
|
| 8 | 8 - August | 1 |
1.8%
|
| 9 | 9 - September | 8 |
14.5%
|
| 10 | 10 - October | 7 |
12.7%
|
| 11 | 11 - November | 2 |
3.6%
|
| 12 | 12 - December | 5 |
9.1%
|
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.