| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 68 |
0.5%
|
| 2 | Twice | 18 |
0.1%
|
| 3 | Three times | 9 |
0.1%
|
| 4 | Four times | 5 |
0%
|
| 5 | More | 11 |
0.1%
|
| 6 | Never | 14951 |
99.3%
|
| Sysmiss | 1265 |