| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 31687 |
59.3%
|
| 1 | once or twice | 8021 |
15%
|
| 2 | a few times | 7289 |
13.6%
|
| 3 | often | 6141 |
11.5%
|
| 7 | not applicable | 2 |
0%
|
| 8 | refused | 15 |
0%
|
| 9 | don't know | 289 |
0.5%
|