| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 1 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| -8 | Refused | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -5 | Not applicable | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -3 | Missing | 5 | 
                                                                 
                                    
                                    35.7%
                                 
                                                             | 
                                                        
                    
| 1 | Days | 3 | 
                                                                 
                                    
                                    21.4%
                                 
                                                             | 
                                                        
                    
| 2 | Months | 1 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 3 | Years | 4 | 
                                                                 
                                    
                                    28.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 16858 |