| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                    
                                    15.1%
                                 | 
| 25 | 1 | 
                                    
                                    1.9%
                                 | |
| 40 | 2 | 
                                    
                                    3.8%
                                 | |
| 50 | 1 | 
                                    
                                    1.9%
                                 | |
| 60 | 4 | 
                                    
                                    7.5%
                                 | |
| 65 | 1 | 
                                    
                                    1.9%
                                 | |
| 67 | 1 | 
                                    
                                    1.9%
                                 | |
| 70 | 11 | 
                                    
                                    20.8%
                                 | |
| 75 | 3 | 
                                    
                                    5.7%
                                 | |
| 80 | 8 | 
                                    
                                    15.1%
                                 | |
| 85 | 1 | 
                                    
                                    1.9%
                                 | |
| 90 | 2 | 
                                    
                                    3.8%
                                 | |
| 95 | 1 | 
                                    
                                    1.9%
                                 | |
| 100 | 9 | 
                                    
                                    17%
                                 | |
| Sysmiss | 162 |