| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 0 | Never | 487 |
40.6%
|
| 1 | Only once | 158 |
13.2%
|
| 2 | A few times | 325 |
27.1%
|
| 3 | Often | 228 |
19%
|
| 9 | Don't know | 1 |
0.1%
|