| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than once a month | 59 | 
                                                                 
                                    
                                    27.1%
                                 
                                                             | 
                                                        
                    
| 2 | Once a month | 93 | 
                                                                 
                                    
                                    42.7%
                                 
                                                             | 
                                                        
                    
| 3 | More than once a month | 66 | 
                                                                 
                                    
                                    30.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 8353 |