| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 262 |
22%
|
| 1 | Just once or twice | 74 |
6.2%
|
| 2 | Several times | 286 |
24%
|
| 3 | Many times | 538 |
45.2%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 31 |
2.6%
|