| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    10.8%
                                 | 
| 2 | 14 | 
                                    
                                    21.5%
                                 | |
| 3 | 11 | 
                                    
                                    16.9%
                                 | |
| 4 | 5 | 
                                    
                                    7.7%
                                 | |
| 5 | 4 | 
                                    
                                    6.2%
                                 | |
| 6 | 4 | 
                                    
                                    6.2%
                                 | |
| 7 | 1 | 
                                    
                                    1.5%
                                 | |
| 8 | 1 | 
                                    
                                    1.5%
                                 | |
| 9 | 3 | 
                                    
                                    4.6%
                                 | |
| 13 | 2 | 
                                    
                                    3.1%
                                 | |
| 15 | 1 | 
                                    
                                    1.5%
                                 | |
| 18 | 1 | 
                                    
                                    1.5%
                                 | |
| 19 | 1 | 
                                    
                                    1.5%
                                 | |
| 20 | 2 | 
                                    
                                    3.1%
                                 | |
| 21 | 1 | 
                                    
                                    1.5%
                                 | |
| 25 | 2 | 
                                    
                                    3.1%
                                 | |
| 27 | 1 | 
                                    
                                    1.5%
                                 | |
| 56 | 1 | 
                                    
                                    1.5%
                                 | |
| 60 | 1 | 
                                    
                                    1.5%
                                 | |
| 280 | 1 | 
                                    
                                    1.5%
                                 | |
| 305 | 1 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 1351 |