| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    2%
                                 | 
| 1 | One hour or less | 8 | 
                                    
                                    5.3%
                                 | 
| 3 | 3 | 
                                    
                                    2%
                                 | |
| 5 | 3 | 
                                    
                                    2%
                                 | |
| 7 | 1 | 
                                    
                                    0.7%
                                 | |
| 14 | 1 | 
                                    
                                    0.7%
                                 | |
| 15 | 1 | 
                                    
                                    0.7%
                                 | |
| 30 | 90 | 
                                    
                                    60%
                                 | |
| 35 | 1 | 
                                    
                                    0.7%
                                 | |
| 36 | 1 | 
                                    
                                    0.7%
                                 | |
| 40 | 5 | 
                                    
                                    3.3%
                                 | |
| 45 | 1 | 
                                    
                                    0.7%
                                 | |
| 48 | 14 | 
                                    
                                    9.3%
                                 | |
| 70 | 1 | 
                                    
                                    0.7%
                                 | |
| 72 | 8 | 
                                    
                                    5.3%
                                 | |
| 80 | 7 | 
                                    
                                    4.7%
                                 | |
| 100 | 1 | 
                                    
                                    0.7%
                                 | |
| 504 | 1 | 
                                    
                                    0.7%
                                 |