| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 16 | 
                                    
                                    10.7%
                                 | |
| 1 | 20 | 
                                    
                                    13.3%
                                 | |
| 2 | 28 | 
                                    
                                    18.7%
                                 | |
| 3 | 17 | 
                                    
                                    11.3%
                                 | |
| 4 | 8 | 
                                    
                                    5.3%
                                 | |
| 5 | 13 | 
                                    
                                    8.7%
                                 | |
| 6 | 9 | 
                                    
                                    6%
                                 | |
| 7 | 5 | 
                                    
                                    3.3%
                                 | |
| 8 | 2 | 
                                    
                                    1.3%
                                 | |
| 9 | 2 | 
                                    
                                    1.3%
                                 | |
| 10 | 5 | 
                                    
                                    3.3%
                                 | |
| 11 | 2 | 
                                    
                                    1.3%
                                 | |
| 12 | 5 | 
                                    
                                    3.3%
                                 | |
| 13 | 2 | 
                                    
                                    1.3%
                                 | |
| 15 | 4 | 
                                    
                                    2.7%
                                 | |
| 17 | 1 | 
                                    
                                    0.7%
                                 | |
| 18 | 1 | 
                                    
                                    0.7%
                                 | |
| 20 | 2 | 
                                    
                                    1.3%
                                 | |
| 21 | 1 | 
                                    
                                    0.7%
                                 | |
| 22 | 1 | 
                                    
                                    0.7%
                                 | |
| 25 | 1 | 
                                    
                                    0.7%
                                 | |
| 40 | 1 | 
                                    
                                    0.7%
                                 | |
| 70 | 2 | 
                                    
                                    1.3%
                                 | |
| 100 | 1 | 
                                    
                                    0.7%
                                 | |
| 145 | 1 | 
                                    
                                    0.7%
                                 | |
| Sysmiss | 213 |