| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 48 | 
                                    
                                    16.3%
                                 | 
| 1 | 60 | 
                                    
                                    20.3%
                                 | |
| 2 | 30 | 
                                    
                                    10.2%
                                 | |
| 3 | 28 | 
                                    
                                    9.5%
                                 | |
| 4 | 6 | 
                                    
                                    2%
                                 | |
| 5 | 14 | 
                                    
                                    4.7%
                                 | |
| 6 | 1 | 
                                    
                                    0.3%
                                 | |
| 7 | 44 | 
                                    
                                    14.9%
                                 | |
| 8 | 1 | 
                                    
                                    0.3%
                                 | |
| 9 | 1 | 
                                    
                                    0.3%
                                 | |
| 10 | 10 | 
                                    
                                    3.4%
                                 | |
| 14 | 4 | 
                                    
                                    1.4%
                                 | |
| 15 | 17 | 
                                    
                                    5.8%
                                 | |
| 20 | 3 | 
                                    
                                    1%
                                 | |
| 21 | 2 | 
                                    
                                    0.7%
                                 | |
| 25 | 1 | 
                                    
                                    0.3%
                                 | |
| 30 | 15 | 
                                    
                                    5.1%
                                 | |
| 40 | 1 | 
                                    
                                    0.3%
                                 | |
| 45 | 2 | 
                                    
                                    0.7%
                                 | |
| 60 | 3 | 
                                    
                                    1%
                                 | |
| 90 | 3 | 
                                    
                                    1%
                                 | |
| 120 | 1 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 1121 |