| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 6 |
1.8%
|
| 2 | Every few weeks | 40 |
11.9%
|
| 3 | Every few months | 130 |
38.7%
|
| 4 | Not at all | 160 |
47.6%
|
| Sysmiss | 104 |