| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 994 |
82.8%
|
| 1 | Once or twice | 120 |
10%
|
| 2 | Several times | 39 |
3.3%
|
| 3 | Many times | 18 |
1.5%
|
| 8 | Refused | 1 |
0.1%
|
| 9 | Don't know | 28 |
2.3%
|