| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                    
                                    23.6%
                                 | 
| 1 | Above 90% | 5 | 
                                    
                                    9.1%
                                 | 
| 2 | Between 50% and 90% | 25 | 
                                    
                                    45.5%
                                 | 
| 3 | Below 50% | 12 | 
                                    
                                    21.8%
                                 | 
| Sysmiss | 56 |