| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 2 |
0.1%
|
| 0 | Never | 1998 |
83.3%
|
| 1 | Only once | 151 |
6.3%
|
| 2 | A few times | 136 |
5.7%
|
| 3 | Often | 61 |
2.5%
|
| 9 | Don't know | 52 |
2.2%
|
| 998 | Refused | 0 |
0%
|