| Value | Category | Cases | |
|---|---|---|---|
| 1 | formal training required | 30 |
9.7%
|
| 2 | on the job experience required | 53 |
17.1%
|
| 3 | both formal and on the job experience required | 9 |
2.9%
|
| 4 | non required | 218 |
70.3%
|
| Sysmiss | 1211 |