| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.1%
|
| 1 | 1-2 production performance indicators | 97 |
26.4%
|
| 2 | 3-9 production performance indicators | 175 |
47.7%
|
| 3 | 10 or more production performance indicators | 91 |
24.8%
|
| Sysmiss | 552 |