| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.8%
|
| 1 | 1-2 production performance indicators | 33 |
13.1%
|
| 2 | 3-9 production performance indicators | 129 |
51.4%
|
| 3 | 10 or more production performance indicators | 87 |
34.7%
|
| Sysmiss | 358 |