| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 985 |
82.1%
|
| 1 | Once or twice | 136 |
11.3%
|
| 2 | Several times | 41 |
3.4%
|
| 3 | Many times | 15 |
1.3%
|
| 8 | Refused | 2 |
0.2%
|
| 9 | Don't know | 21 |
1.8%
|