| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 18 | 
                                    
                                    0.4%
                                 | 
| 2 | NO | 3949 | 
                                    
                                    95.8%
                                 | 
| 9 | NO RESPONDE | 4 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 151 | 
                                    
                                    3.7%
                                 |