| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 7 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 23 | 
                                                                 
                                    
                                    20.5%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 57 | 
                                                                 
                                    
                                    50.9%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 25 | 
                                                                 
                                    
                                    22.3%
                                 
                                                             |