| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| 1 | 1-2 production performance indicators | 26 |
20.5%
|
| 2 | 3-9 production performance indicators | 66 |
52%
|
| 3 | 10 or more production performance indicators | 34 |
26.8%
|
| Sysmiss | 226 |