| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.Once | 343 |
11.6%
|
| 2 | 2.Twice | 2055 |
69.3%
|
| 3 | 3.More than twice | 567 |
19.1%
|
| 9 | 9.MISSING | 1 |
0%
|
| Sysmiss | 471 |