| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| 1 | 1-2 production performance indicators | 89 |
22.3%
|
| 2 | 3-9 production performance indicators | 177 |
44.3%
|
| 3 | 10 or more production performance indicators | 133 |
33.3%
|
| Sysmiss | 431 |