| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0%
|
| 0 | Never | 1488 |
62%
|
| 1 | Only once | 455 |
19%
|
| 2 | A few times | 316 |
13.2%
|
| 3 | Often | 136 |
5.7%
|
| 9 | Don't know | 4 |
0.2%
|