| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 3 | 
                                    
                                    1.3%
                                 | |
| 10 | 1 | 
                                    
                                    0.4%
                                 | |
| 20 | 1 | 
                                    
                                    0.4%
                                 | |
| 30 | 1 | 
                                    
                                    0.4%
                                 | |
| 95 | 1 | 
                                    
                                    0.4%
                                 | |
| 100 | 226 | 
                                    
                                    97%
                                 | |
| Sysmiss | 127 |