| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 1575 |
67.5%
|
| 1 | Once | 360 |
15.4%
|
| 2 | Twice | 149 |
6.4%
|
| 3 | Three times | 37 |
1.6%
|
| 4 | More than three times | 211 |
9%
|
| Sysmiss | 2890 |