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
14488
7a. How old was the participant when they had their first menstrual period? (menarche)
Data file: UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Overview
Valid:
60
Range:
-
Format:
Questions and instructions
Question pretext
[packet]='I' OR [packet]='I4'
Categories
| Value | Category | Cases | |
|---|---|---|---|
| 5 | 5 | 1 |
1.7%
|
| 6 | 6 | 4 |
6.7%
|
| 7 | 7 | 0 |
0%
|
| 8 | 8 | 0 |
0%
|
| 9 | 9 | 0 |
0%
|
| 10 | 10 | 0 |
0%
|
| 11 | 11 | 0 |
0%
|
| 12 | 12 | 0 |
0%
|
| 13 | 13 | 0 |
0%
|
| 14 | 14 | 0 |
0%
|
| 15 | 15 | 21 |
35%
|
| 16 | 16 | 0 |
0%
|
| 17 | 17 | 0 |
0%
|
| 18 | 18 | 2 |
3.3%
|
| 19 | 19 | 22 |
36.7%
|
| 20 | 20 | 0 |
0%
|
| 21 | 21 | 4 |
6.7%
|
| 22 | 22 | 1 |
1.7%
|
| 23 | 23 | 0 |
0%
|
| 24 | 24 | 0 |
0%
|
| 25 | 25 | 0 |
0%
|
| 888 | 888 | 0 |
0%
|
| 999 | 999 | 5 |
8.3%
|
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.
Others
Notes
Field Note : 5-25, 888 = Never had a menstrual period, 999 = Unknown