| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 11717 |
21.9%
|
| 1 | once or twice | 2455 |
4.6%
|
| 2 | a few times | 1579 |
3%
|
| 3 | often | 1263 |
2.4%
|
| 7 | not applicable | 36369 |
68.1%
|
| 8 | refused | 20 |
0%
|
| 9 | don't know | 41 |
0.1%
|