| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 3086 |
95%
|
| 2 | Once | 127 |
3.9%
|
| 3 | Twice | 22 |
0.7%
|
| 4 | Three times | 2 |
0.1%
|
| 5 | Four times or more | 9 |
0.3%
|
| 7 | 1 |
0%
|
|
| Sysmiss | 352 |