| Value | Category | Cases | |
|---|---|---|---|
| -1 | 844 |
21.3%
|
|
| 0 | No | 2811 |
70.9%
|
| 1 | Once | 152 |
3.8%
|
| 2 | Multiple times | 52 |
1.3%
|
| 3 | NA | 107 |
2.7%
|
| Sysmiss | 10911 |