| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 4 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 9 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 71 | 
                                                                 
                                    
                                    63.4%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 28 | 
                                                                 
                                    
                                    25%
                                 
                                                             |