| Value | Category | Cases | |
|---|---|---|---|
| 0 | less than one month | 4 |
4.6%
|
| 3 | 5 |
5.7%
|
|
| 4 | 3 |
3.4%
|
|
| 5 | 3 |
3.4%
|
|
| 6 | 2 |
2.3%
|
|
| 11 | 5 |
5.7%
|
|
| 12 | 53 |
60.9%
|
|
| 98 | don't know | 12 |
13.8%
|
| 99 | refused | 0 |
0%
|
| Sysmiss | 4818 |