| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 | 340 | 
                                    
                                    73.3%
                                 | 
| 2 | 0 | 106 | 
                                    
                                    22.8%
                                 | 
| 3 | Don't know | 18 | 
                                    
                                    3.9%
                                 | 
| Sysmiss | 401 |