| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 34 | 
                                                                 
                                    
                                    12%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 53 | 
                                                                 
                                    
                                    18.7%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 68 | 
                                                                 
                                    
                                    23.9%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 129 | 
                                                                 
                                    
                                    45.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 91 |