| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 32 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 76 | 
                                                                 
                                    
                                    27%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 131 | 
                                                                 
                                    
                                    46.6%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 42 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 94 |