| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not interested in participating | 5 |
15.6%
|
| 2 | Interested in participating, but there was no possibility to | 6 |
18.8%
|
| 3 | Lack of oppurtunity | 20 |
62.5%
|
| 4 | Others | 1 |
3.1%
|
| Sysmiss | 609 |