| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 799 |
35.6%
|
| 2 | Last 2 months | 657 |
29.3%
|
| 3 | 2-3 months | 279 |
12.4%
|
| 4 | 4-6 months | 131 |
5.8%
|
| 5 | before 7 months | 52 |
2.3%
|
| 6 | More than a year | 324 |
14.5%
|
| Sysmiss | 55 |