| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0%
|
| 0 | Never | 1897 |
79%
|
| 1 | Only once | 294 |
12.3%
|
| 2 | A few times | 145 |
6%
|
| 3 | Often | 56 |
2.3%
|
| 9 | Don't know | 7 |
0.3%
|