| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 5 | 
                                    
                                    3.7%
                                 | 
| -8 | refusal | 7 | 
                                    
                                    5.2%
                                 | 
| 1 | yes | 3 | 
                                    
                                    2.2%
                                 | 
| 2 | no | 120 | 
                                    
                                    88.9%
                                 | 
| Sysmiss | 820 |