| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
0.9%
|
| 1 | 1-2 production performance indicators | 196 |
30%
|
| 2 | 3-9 production performance indicators | 330 |
50.5%
|
| 3 | 10 or more production performance indicators | 121 |
18.5%
|
| Sysmiss | 1072 |