| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 0 | 17 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 1 | One minute or less | 64 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    
| 3 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 9 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 8 | 2 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 10 | 19 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 27 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    |
| 20 | 24 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    |
| 25 | 8 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 30 | 56 | 
                                                                 
                                    
                                    18.4%
                                 
                                                             | 
                                                        
                    |
| 35 | 8 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 40 | 22 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    |
| 45 | 31 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 50 | 12 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 55 | 4 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 60 |