| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 weeks | 15 | 
                                    
                                    4.1%
                                 | 
| 2 | Between 2 and 4 weeks | 4 | 
                                    
                                    1.1%
                                 | 
| 3 | Between 1 and 2 months | 17 | 
                                    
                                    4.7%
                                 | 
| 4 | Between 2 and 6 months | 12 | 
                                    
                                    3.3%
                                 | 
| 5 | More than 6 months | 44 | 
                                    
                                    12.2%
                                 | 
| 6 | Don’t know (uncertain) | 270 | 
                                    
                                    74.6%
                                 | 
| Sysmiss | 2038 |