| Value | Category | Cases | |
|---|---|---|---|
| -99 | 9 |
3.2%
|
|
| 1 | Every few DAYS | 7 |
2.5%
|
| 2 | Every few WEEKS 3, Every few MONTHS 4, Not at all | 28 |
10%
|
| 3 | 115 |
40.9%
|
|
| 4 | 122 |
43.4%
|
|
| Sysmiss | 29 |