| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing data | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Know but can't remember | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 2 | Incorrect guess | 601 | 
                                                                 
                                    
                                    50.1%
                                 
                                                             | 
                                                        
                    
| 3 | Correct answer | 57 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| 9 | Don't know | 536 | 
                                                                 
                                    
                                    44.7%
                                 
                                                             | 
                                                        
                    
| 998 | Refused | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             |