| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 66 |
0.5%
|
| 2 | Twice | 9 |
0.1%
|
| 3 | Three times | 1 |
0%
|
| 4 | Four times | 0 |
0%
|
| 5 | More | 3 |
0%
|
| 6 | Never | 13987 |
99.4%
|
| Sysmiss | 991 |