| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    11.1%
                                 | 
| 1 | 1-2 production performance indicators | 6 | 
                                    
                                    33.3%
                                 | 
| 2 | 3-9 production performance indicators | 5 | 
                                    
                                    27.8%
                                 | 
| 3 | 10 or more production performance indicators | 5 | 
                                    
                                    27.8%
                                 | 
| Sysmiss | 93 |