| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.3%
                                 | 
| 1 | 1-2 production performance indicators | 74 | 
                                    
                                    46.3%
                                 | 
| 2 | 3-9 production performance indicators | 49 | 
                                    
                                    30.6%
                                 | 
| 3 | 10 or more production performance indicators | 35 | 
                                    
                                    21.9%
                                 | 
| Sysmiss | 204 |