| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
3.6%
|
| 1 | 1-2 production performance indicators | 4 |
14.3%
|
| 2 | 3-9 production performance indicators | 18 |
64.3%
|
| 3 | 10 or more production performance indicators | 5 |
17.9%
|
| Sysmiss | 75 |