| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 1592 |
68.3%
|
| 1 | Once | 236 |
10.1%
|
| 2 | Twice | 237 |
10.2%
|
| 3 | Three times | 112 |
4.8%
|
| 4 | More than three times | 155 |
6.6%
|
| Sysmiss | 2890 |