| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 35 |
0.2%
|
| 2 | Twice | 15 |
0.1%
|
| 3 | Three times | 2 |
0%
|
| 4 | Four times | 0 |
0%
|
| 5 | More | 2 |
0%
|
| 6 | Never | 14992 |
99.6%
|
| Sysmiss | 1279 |