| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| 1 | 1-2 production performance indicators | 79 |
21.2%
|
| 2 | 3-9 production performance indicators | 175 |
47%
|
| 3 | 10 or more production performance indicators | 117 |
31.5%
|
| Sysmiss | 1146 |