| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 7 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 22 | 
                                                                 
                                    
                                    16.2%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 76 | 
                                                                 
                                    
                                    55.9%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 31 | 
                                                                 
                                    
                                    22.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 26 |