| Value | Category | Cases | |
|---|---|---|---|
| 1 | up to 20 hours | 15 |
5.4%
|
| 2 | more than 20 up to 40 hours | 58 |
20.7%
|
| 3 | over 40 hours | 196 |
70%
|
| 4 | uninformed | 11 |
3.9%
|
| Sysmiss | 210 |