| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 557 | 
                                    
                                    46.4%
                                 | 
| 1 | Just once or twice | 54 | 
                                    
                                    4.5%
                                 | 
| 2 | Several times | 202 | 
                                    
                                    16.8%
                                 | 
| 3 | Many times | 199 | 
                                    
                                    16.6%
                                 | 
| 4 | Always | 187 | 
                                    
                                    15.6%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |