| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.4%
|
| 1 | 1-2 production performance indicators | 55 |
9.8%
|
| 2 | 3-9 production performance indicators | 306 |
54.3%
|
| 3 | 10 or more production performance indicators | 201 |
35.6%
|
| Sysmiss | 431 |