| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than once a month | 8 | 
                                                                 
                                    
                                    20.5%
                                 
                                                             | 
                                                        
                    
| 2 | Once a month | 24 | 
                                                                 
                                    
                                    61.5%
                                 
                                                             | 
                                                        
                    
| 3 | More than once a month | 7 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 8532 |