| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | 2 | 
                                    
                                    3.8%
                                 | |
| 2 | 2 | 
                                    
                                    3.8%
                                 | |
| 3 | 4 | 
                                    
                                    7.7%
                                 | |
| 5 | 1 | 
                                    
                                    1.9%
                                 | |
| 7 | 9 | 
                                    
                                    17.3%
                                 | |
| 10 | 1 | 
                                    
                                    1.9%
                                 | |
| 14 | 6 | 
                                    
                                    11.5%
                                 | |
| 15 | 2 | 
                                    
                                    3.8%
                                 | |
| 20 | 2 | 
                                    
                                    3.8%
                                 | |
| 21 | 1 | 
                                    
                                    1.9%
                                 | |
| 25 | 1 | 
                                    
                                    1.9%
                                 | |
| 30 | 10 | 
                                    
                                    19.2%
                                 | |
| 45 | 5 | 
                                    
                                    9.6%
                                 | |
| 60 | 3 | 
                                    
                                    5.8%
                                 | |
| 90 | 1 | 
                                    
                                    1.9%
                                 | |
| 120 | 1 | 
                                    
                                    1.9%
                                 | |
| 180 | 1 | 
                                    
                                    1.9%
                                 | |
| Sysmiss | 311 |