| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 0 | Never | 1200 |
92%
|
| 1 | Only once | 30 |
2.3%
|
| 2 | A few times | 39 |
3%
|
| 3 | Often | 27 |
2.1%
|
| 9 | Don't know | 7 |
0.5%
|
| 998 | Refused | 0 |
0%
|