| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1%
|
| 1 | 1-2 production performance indicators | 68 |
34%
|
| 2 | 3-9 production performance indicators | 104 |
52%
|
| 3 | 10 or more production performance indicators | 26 |
13%
|
| Sysmiss | 828 |