| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 3 |
0.3%
|
| 0 | Never | 1158 |
96.5%
|
| 1 | Only once | 18 |
1.5%
|
| 2 | A few times | 10 |
0.8%
|
| 3 | Often | 5 |
0.4%
|
| 9 | Don't know | 6 |
0.5%
|
| 998 | Refused | 0 |
0%
|