| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 2594 |
82.5%
|
| 2 | Once | 292 |
9.3%
|
| 3 | Twice | 101 |
3.2%
|
| 4 | 3-4 times | 39 |
1.2%
|
| 5 | 5 times or more | 21 |
0.7%
|
| 8 | Don't know | 99 |
3.1%
|
| Sysmiss | 37 |