| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 917 |
76.4%
|
| 1 | Once or twice | 144 |
12%
|
| 2 | Several times | 78 |
6.5%
|
| 3 | Many times | 49 |
4.1%
|
| 8 | Refused | 2 |
0.2%
|
| 9 | Don't know | 10 |
0.8%
|