| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| 1 | 1-2 production performance indicators | 25 |
16.1%
|
| 2 | 3-9 production performance indicators | 87 |
56.1%
|
| 3 | 10 or more production performance indicators | 41 |
26.5%
|
| Sysmiss | 165 |