| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
5.1%
|
| 1 | 1-2 production performance indicators | 47 |
34.1%
|
| 2 | 3-9 production performance indicators | 52 |
37.7%
|
| 3 | 10 or more production performance indicators | 32 |
23.2%
|
| Sysmiss | 240 |