| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 23738 |
49.4%
|
| 1 | once or twice | 2495 |
5.2%
|
| 2 | a few times | 1729 |
3.6%
|
| 3 | often | 1256 |
2.6%
|
| 7 | not applicable | 18811 |
39.1%
|
| 8 | refused | 10 |
0%
|
| 9 | don't know | 45 |
0.1%
|