| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 4 | 1 | 
                                    
                                    4%
                                 | |
| 5 | 2 | 
                                    
                                    8%
                                 | |
| 6 | 1 | 
                                    
                                    4%
                                 | |
| 7 | 2 | 
                                    
                                    8%
                                 | |
| 8 | 2 | 
                                    
                                    8%
                                 | |
| 9 | 1 | 
                                    
                                    4%
                                 | |
| 10 | 1 | 
                                    
                                    4%
                                 | |
| 12 | 2 | 
                                    
                                    8%
                                 | |
| 14 | 1 | 
                                    
                                    4%
                                 | |
| 16 | 1 | 
                                    
                                    4%
                                 | |
| 17 | 1 | 
                                    
                                    4%
                                 | |
| 20 | 1 | 
                                    
                                    4%
                                 | |
| 33 | 1 | 
                                    
                                    4%
                                 | |
| 40 | 2 | 
                                    
                                    8%
                                 | |
| 52 | 1 | 
                                    
                                    4%
                                 | |
| 60 | 1 | 
                                    
                                    4%
                                 | |
| 75 | 1 | 
                                    
                                    4%
                                 | |
| 180 | 1 | 
                                    
                                    4%
                                 | |
| 252 | 1 | 
                                    
                                    4%
                                 | |
| 300 | 1 | 
                                    
                                    4%
                                 | |
| Sysmiss | 217 |