| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 3 |
0.7%
|
| 2 | Every few weeks | 14 |
3.2%
|
| 3 | Every few months | 95 |
21.4%
|
| 4 | Not at all | 331 |
74.7%
|
| Sysmiss | 62 |