| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 39 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    
| 2 | Less than once a year | 41 | 
                                                                 
                                    
                                    14.1%
                                 
                                                             | 
                                                        
                    
| 3 | Once a year to a few times a year | 109 | 
                                                                 
                                    
                                    37.5%
                                 
                                                             | 
                                                        
                    
| 4 | Less than once a month | 26 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    
| 5 | At least once a month | 49 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    
| 6 | At least once a week | 27 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 84 |