| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.6%
|
| 1 | 1-2 production performance indicators | 24 |
14.9%
|
| 2 | 3-9 production performance indicators | 87 |
54%
|
| 3 | 10 or more production performance indicators | 49 |
30.4%
|
| Sysmiss | 107 |