| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 28 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 64 | 
                                                                 
                                    
                                    22.9%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 135 | 
                                                                 
                                    
                                    48.4%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 52 | 
                                                                 
                                    
                                    18.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 96 |