When did your last menstrual period start - number?
Categories
Value
Category
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
24
25
26
27
94
In menopause/had hysterectomy
95
Before last birth
96
Never menstruated
99
Missing
Sysmiss
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.