| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1060 | 
                                    
                                    88.3%
                                 | 
| 1 | Just once or twice | 31 | 
                                    
                                    2.6%
                                 | 
| 2 | Several times | 69 | 
                                    
                                    5.8%
                                 | 
| 3 | Many times | 19 | 
                                    
                                    1.6%
                                 | 
| 4 | Always | 21 | 
                                    
                                    1.8%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |