| Value | Category | Cases | |
|---|---|---|---|
| 1 | Just before period begins | 9226 |
32.3%
|
| 2 | Right after period has ended | 12533 |
43.9%
|
| 3 | Half way between two periods | 6229 |
21.8%
|
| 6 | Other | 9 |
0%
|
| 8 | Don't Know | 540 |
1.9%
|
| Sysmiss | 20500 |