| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than one day | 0 | 
                                    
                                    0%
                                 | 
| 1 | 1 | 
                                    
                                    1.5%
                                 | |
| 2 | 4 | 
                                    
                                    6%
                                 | |
| 3 | 9 | 
                                    
                                    13.4%
                                 | |
| 4 | 7 | 
                                    
                                    10.4%
                                 | |
| 5 | 11 | 
                                    
                                    16.4%
                                 | |
| 6 | 2 | 
                                    
                                    3%
                                 | |
| 7 | 3 | 
                                    
                                    4.5%
                                 | |
| 8 | 1 | 
                                    
                                    1.5%
                                 | |
| 9 | 1 | 
                                    
                                    1.5%
                                 | |
| 10 | 6 | 
                                    
                                    9%
                                 | |
| 11 | 2 | 
                                    
                                    3%
                                 | |
| 12 | 2 | 
                                    
                                    3%
                                 | |
| 13 | 1 | 
                                    
                                    1.5%
                                 | |
| 14 | 3 | 
                                    
                                    4.5%
                                 | |
| 15 | 6 | 
                                    
                                    9%
                                 | |
| 17 | 3 | 
                                    
                                    4.5%
                                 | |
| 18 | 3 | 
                                    
                                    4.5%
                                 | |
| 20 | 1 | 
                                    
                                    1.5%
                                 | |
| 24 | 1 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 931 |