| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1116 |
93%
|
| 1 | Once or twice | 40 |
3.3%
|
| 2 | Several times | 20 |
1.7%
|
| 3 | Many times | 19 |
1.6%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 5 |
0.4%
|