| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 0 | Never | 502 | 
                                                                 
                                    
                                    41.8%
                                 
                                                             | 
                                                        
                    
| 1 | Just once or twice | 281 | 
                                                                 
                                    
                                    23.4%
                                 
                                                             | 
                                                        
                    
| 2 | Several times | 286 | 
                                                                 
                                    
                                    23.8%
                                 
                                                             | 
                                                        
                    
| 3 | Many times | 112 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 4 | Always | 18 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 8 | Refused | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9 | Don't know | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |