| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| 1 | 1-2 production performance indicators | 81 |
22.9%
|
| 2 | 3-9 production performance indicators | 179 |
50.7%
|
| 3 | 10 or more production performance indicators | 90 |
25.5%
|
| Sysmiss | 863 |