| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 42 |
72.4%
|
| 2 | Twice | 8 |
13.8%
|
| 3 | Three times | 0 |
0%
|
| 4 | More than three times | 7 |
12.1%
|
| 8 | Unknown | 1 |
1.7%
|
| Sysmiss | 883 |