| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.5%
|
| 1 | 1-2 production performance indicators | 8 |
12.1%
|
| 2 | 3-9 production performance indicators | 41 |
62.1%
|
| 3 | 10 or more production performance indicators | 16 |
24.2%
|
| Sysmiss | 85 |