| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 317 | 
                                    
                                    26.4%
                                 | 
| 1 | Just once or twice | 92 | 
                                    
                                    7.7%
                                 | 
| 2 | Several times | 314 | 
                                    
                                    26.2%
                                 | 
| 3 | Many times | 411 | 
                                    
                                    34.3%
                                 | 
| 4 | Always | 66 | 
                                    
                                    5.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |