| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than once a month | 305 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             | 
                                                        
                    
| 2 | Once a month | 985 | 
                                                                 
                                    
                                    59.6%
                                 
                                                             | 
                                                        
                    
| 3 | More than once a month | 363 | 
                                                                 
                                    
                                    22%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6918 |