| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 |
2.5%
|
| 1 | 1-2 production performance indicators | 124 |
13.5%
|
| 2 | 3-9 production performance indicators | 468 |
51%
|
| 3 | 10 or more production performance indicators | 302 |
32.9%
|
| Sysmiss | 1272 |