| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3495 |
97.8%
|
| 1 | Once or twice | 56 |
1.6%
|
| 2 | Several times | 13 |
0.4%
|
| 3 | Many times | 5 |
0.1%
|
| 8 | Refused | 0 |
0%
|
| 9 | Missing | 3 |
0.1%
|
| Sysmiss | 47 |