| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 weeks | 5 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    
| 2 | Between 2 and 4 weeks | 3 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 3 | Between 1 and 2 months | 6 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    
| 4 | Between 2 and 6 months | 6 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    
| 5 | More than 6 months | 6 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    
| 6 | Never | 6 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    
| 7 | Don’t know (uncertain) | 16 | 
                                                                 
                                    
                                    33.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 452 |