| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| 1 | 1-2 production performance indicators | 90 |
22.4%
|
| 2 | 3-9 production performance indicators | 177 |
44.1%
|
| 3 | 10 or more production performance indicators | 133 |
33.2%
|
| Sysmiss | 449 |