| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 |
0.9%
|
| 1 | 1-2 production performance indicators | 807 |
44.1%
|
| 2 | 3-9 production performance indicators | 581 |
31.7%
|
| 3 | 10 or more production performance indicators | 163 |
8.9%
|
| 4 | No production performance indicators | 263 |
14.4%
|
| Sysmiss | 7546 |