| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 1 |
1.5%
|
| 2 | Every few weeks | 15 |
23.1%
|
| 3 | Every few months | 31 |
47.7%
|
| 4 | Not at all | 18 |
27.7%
|
| Sysmiss | 21 |