| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, entire questionnaire | 135 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    
| 2 | Yes, part of questionnaire | 24 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 3 | No, not used | 7756 | 
                                                                 
                                    
                                    98%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1593 |