| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 weeks | 2 | 
                                    
                                    4.3%
                                 | 
| 2 | Between 2 and 4 weeks | 2 | 
                                    
                                    4.3%
                                 | 
| 3 | Between 1 and 2 months | 6 | 
                                    
                                    13%
                                 | 
| 4 | Between 2 and 6 months | 4 | 
                                    
                                    8.7%
                                 | 
| 5 | More than 6 months | 4 | 
                                    
                                    8.7%
                                 | 
| 6 | Never | 4 | 
                                    
                                    8.7%
                                 | 
| 7 | Don’t know (uncertain) | 24 | 
                                    
                                    52.2%
                                 | 
| Sysmiss | 2354 |