| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 6 |
2.1%
|
| 2 | Every few weeks | 32 |
11.3%
|
| 3 | Every few months | 131 |
46.1%
|
| 4 | Not at all | 115 |
40.5%
|
| Sysmiss | 91 |