| Value | Category | Cases | |
|---|---|---|---|
| -9 | do not know | 1 |
1.9%
|
| 1 | less then one month | 8 |
15.1%
|
| 2 | 5 |
9.4%
|
|
| 3 | 16 |
30.2%
|
|
| 4 | 10 |
18.9%
|
|
| 5 | 4 |
7.5%
|
|
| 6 | 4 |
7.5%
|
|
| 7 | 1 |
1.9%
|
|
| 8 | 4 |
7.5%
|
|
| Sysmiss | 95 |