| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.6%
                                 | 
| 0 | 42 | 
                                    
                                    33.6%
                                 | |
| 1 | 20 | 
                                    
                                    16%
                                 | |
| 2 | 14 | 
                                    
                                    11.2%
                                 | |
| 3 | 7 | 
                                    
                                    5.6%
                                 | |
| 4 | 5 | 
                                    
                                    4%
                                 | |
| 5 | 7 | 
                                    
                                    5.6%
                                 | |
| 6 | 2 | 
                                    
                                    1.6%
                                 | |
| 7 | 1 | 
                                    
                                    0.8%
                                 | |
| 8 | 6 | 
                                    
                                    4.8%
                                 | |
| 9 | 2 | 
                                    
                                    1.6%
                                 | |
| 10 | 4 | 
                                    
                                    3.2%
                                 | |
| 14 | 1 | 
                                    
                                    0.8%
                                 | |
| 15 | 2 | 
                                    
                                    1.6%
                                 | |
| 20 | 1 | 
                                    
                                    0.8%
                                 | |
| 23 | 1 | 
                                    
                                    0.8%
                                 | |
| 30 | 1 | 
                                    
                                    0.8%
                                 | |
| 40 | 4 | 
                                    
                                    3.2%
                                 | |
| 48 | 1 | 
                                    
                                    0.8%
                                 | |
| 52 | 1 | 
                                    
                                    0.8%
                                 | |
| 65 | 1 | 
                                    
                                    0.8%
                                 | |
| Sysmiss | 1291 |