| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 12139 |
22.7%
|
| 1 | once or twice | 5284 |
9.9%
|
| 2 | a few times | 6320 |
11.8%
|
| 3 | often | 6797 |
12.7%
|
| 7 | not applicable | 22614 |
42.3%
|
| 8 | refused | 14 |
0%
|
| 9 | don't know | 276 |
0.5%
|