| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.6%
|
| 1 | 1-2 production performance indicators | 136 |
54.2%
|
| 2 | 3-9 production performance indicators | 65 |
25.9%
|
| 3 | 10 or more production performance indicators | 46 |
18.3%
|
| Sysmiss | 757 |