| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 624 | 
                                    
                                    52%
                                 | 
| 1 | Just once or twice | 134 | 
                                    
                                    11.2%
                                 | 
| 2 | Several times | 249 | 
                                    
                                    20.8%
                                 | 
| 3 | Many times | 165 | 
                                    
                                    13.8%
                                 | 
| 4 | Always | 28 | 
                                    
                                    2.3%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |