| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.4%
|
| 1 | 1-2 production performance indicators | 18 |
24.3%
|
| 2 | 3-9 production performance indicators | 39 |
52.7%
|
| 3 | 10 or more production performance indicators | 16 |
21.6%
|
| Sysmiss | 71 |