| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3506 |
98.2%
|
| 1 | Once or twice | 54 |
1.5%
|
| 2 | Several times | 6 |
0.2%
|
| 3 | Many times | 3 |
0.1%
|
| 8 | Refused | 0 |
0%
|
| 9 | Missing | 3 |
0.1%
|
| Sysmiss | 47 |