| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | One month or less | 34 | 
                                                                 
                                    
                                    23%
                                 
                                                             | 
                                                        
                    
| 2 | 14 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 48 | 
                                                                 
                                    
                                    32.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 24 | 
                                                                 
                                    
                                    16.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 4 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 6 | 17 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 2 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 3 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 11 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 444 |