| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 3 |
0.3%
|
| 0 | Never | 1080 |
90%
|
| 1 | Only once | 47 |
3.9%
|
| 2 | A few times | 48 |
4%
|
| 3 | Often | 18 |
1.5%
|
| 9 | Don't know | 4 |
0.3%
|