| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 2117 | 
                                    
                                    88.2%
                                 | 
| 1 | Once or twice | 135 | 
                                    
                                    5.6%
                                 | 
| 2 | Several times | 110 | 
                                    
                                    4.6%
                                 | 
| 3 | Many times | 35 | 
                                    
                                    1.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 3 | 
                                    
                                    0.1%
                                 |