| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 3 months | 129 |
23.5%
|
| 2 | 3 - 6 months | 198 |
36.1%
|
| 3 | 6 months or more | 111 |
20.3%
|
| 4 | It is difficult to answer | 110 |
20.1%
|
| Sysmiss | 28905 |