| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 4 |
1.9%
|
| 2 | Every few weeks | 6 |
2.8%
|
| 3 | Every few months | 29 |
13.5%
|
| 4 | Not at all | 176 |
81.9%
|
| Sysmiss | 45 |