| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 15135 |
31.5%
|
| 1 | once or twice | 1675 |
3.5%
|
| 2 | a few times | 998 |
2.1%
|
| 3 | often | 557 |
1.2%
|
| 7 | not applicable | 29680 |
61.7%
|
| 8 | refused | 7 |
0%
|
| 9 | don't know | 32 |
0.1%
|