| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.5%
|
| 1 | 1-2 production performance indicators | 80 |
29.2%
|
| 2 | 3-9 production performance indicators | 160 |
58.4%
|
| 3 | 10 or more production performance indicators | 30 |
10.9%
|
| Sysmiss | 228 |