| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 1 |
1.3%
|
| 2 | Every few weeks | 9 |
11.5%
|
| 3 | Every few months | 21 |
26.9%
|
| 4 | Not at all | 47 |
60.3%
|
| Sysmiss | 31 |