| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 5 |
1.6%
|
| 2 | Every few weeks | 23 |
7.3%
|
| 3 | Every few months | 153 |
48.3%
|
| 4 | Not at all | 136 |
42.9%
|
| Sysmiss | 76 |