| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 623 | 
                                    
                                    51.9%
                                 | 
| 1 | Just once or twice | 257 | 
                                    
                                    21.4%
                                 | 
| 2 | Several times | 135 | 
                                    
                                    11.3%
                                 | 
| 3 | Many times | 122 | 
                                    
                                    10.2%
                                 | 
| 4 | Always | 61 | 
                                    
                                    5.1%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 2 | 
                                    
                                    0.2%
                                 |