| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 156 | 
                                
                                2.9%
                             | 
| 1 | Yes | 102 | 
                                
                                1.9%
                             | 
| 8 | Don't know | 14 | 
                                
                                0.3%
                             | 
| 9 | Not yet 9 months | 550 | 
                                
                                10.2%
                             | 
| 99 | Not applicable | 4571 | 
                                
                                84.8%
                             | 
| Sysmiss | 1 |