| Value | Category | Cases | |
|---|---|---|---|
| 1 | Used every time | 9 |
21.4%
|
| 2 | There has been at least one occasion of non-use | 32 |
76.2%
|
| 999 | I don't wish to answer | 1 |
2.4%
|
| Sysmiss | 207 |