| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 4 |
22.2%
|
| 2 | Twice | 1 |
5.6%
|
| 3 | Three times | 0 |
0%
|
| 4 | Four times | 0 |
0%
|
| 5 | more | 0 |
0%
|
| 6 | Never | 13 |
72.2%
|
| Sysmiss | 15039 |