| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 2 |
0.4%
|
| 2 | Every few weeks | 39 |
7.9%
|
| 3 | Every few months | 310 |
63.1%
|
| 4 | Not at all | 140 |
28.5%
|
| -99 | 35 | ||
| Sysmiss | 54 |