| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                    
                                    9.4%
                                 | 
| 0 | 5 | 
                                    
                                    9.4%
                                 | |
| 1 | 4 | 
                                    
                                    7.5%
                                 | |
| 2 | 9 | 
                                    
                                    17%
                                 | |
| 3 | 7 | 
                                    
                                    13.2%
                                 | |
| 4 | 2 | 
                                    
                                    3.8%
                                 | |
| 5 | 2 | 
                                    
                                    3.8%
                                 | |
| 6 | 3 | 
                                    
                                    5.7%
                                 | |
| 7 | 1 | 
                                    
                                    1.9%
                                 | |
| 8 | 1 | 
                                    
                                    1.9%
                                 | |
| 9 | 2 | 
                                    
                                    3.8%
                                 | |
| 10 | 3 | 
                                    
                                    5.7%
                                 | |
| 12 | 2 | 
                                    
                                    3.8%
                                 | |
| 14 | 1 | 
                                    
                                    1.9%
                                 | |
| 15 | 1 | 
                                    
                                    1.9%
                                 | |
| 17 | 1 | 
                                    
                                    1.9%
                                 | |
| 18 | 1 | 
                                    
                                    1.9%
                                 | |
| 20 | 2 | 
                                    
                                    3.8%
                                 | |
| 45 | 1 | 
                                    
                                    1.9%
                                 | |
| Sysmiss | 162 |