| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 33 | 
                                                                 
                                    
                                    11.7%
                                 
                                                             | 
                                                        
                    
| 2 | Every few weeks | 84 | 
                                                                 
                                    
                                    29.8%
                                 
                                                             | 
                                                        
                    
| 3 | Every few months | 125 | 
                                                                 
                                    
                                    44.3%
                                 
                                                             | 
                                                        
                    
| 4 | Not at all | 40 | 
                                                                 
                                    
                                    14.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 93 |