| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    
| 0 | Less than one day | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    
| 14 | 4 | 
                                                                 
                                    
                                    20%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 21 | 2 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 24 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 28 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 45 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 51 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 90 | 2 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 270 | 1 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 94 |