| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 4 |
0%
|
| 0 | Never | 19847 |
71.6%
|
| 1 | Only once | 2674 |
9.6%
|
| 2 | A few times | 3370 |
12.2%
|
| 3 | Often | 1627 |
5.9%
|
| 9 | Don't know | 191 |
0.7%
|
| 998 | Refused | 0 |
0%
|