| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 355 | 
                                    
                                    29.6%
                                 | 
| 1 | Just once or twice | 109 | 
                                    
                                    9.1%
                                 | 
| 2 | Several times | 382 | 
                                    
                                    31.8%
                                 | 
| 3 | Many times | 312 | 
                                    
                                    26%
                                 | 
| 4 | Always | 37 | 
                                    
                                    3.1%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 5 | 
                                    
                                    0.4%
                                 |