| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
0.6%
|
| 1 | 1-2 production performance indicators | 189 |
14.9%
|
| 2 | 3-9 production performance indicators | 686 |
54.1%
|
| 3 | 10 or more production performance indicators | 387 |
30.5%
|
| Sysmiss | 1428 |