| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 0 | Never | 125 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             | 
                                                        
                    
| 1 | Once or twice | 180 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    
| 2 | Several times | 148 | 
                                                                 
                                    
                                    12.3%
                                 
                                                             | 
                                                        
                    
| 3 | Many times | 81 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    
| 7 | Not applicable/Saw no problems | 673 | 
                                                                 
                                    
                                    55.7%
                                 
                                                             | 
                                                        
                    
| 9 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 998 | Refused | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             |