| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 590 |
49%
|
| 1 | Just once or twice | 150 |
12.5%
|
| 2 | Several times | 273 |
22.7%
|
| 3 | Many times | 119 |
9.9%
|
| 4 | Always | 64 |
5.3%
|
| 8 | Refused | 2 |
0.2%
|
| 9 | Don't know | 6 |
0.5%
|