| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1435 | 
                                                                 
                                    
                                    95.1%
                                 
                                                             | 
                                                        
                    
| 2 | Rarely (once or twice in the month) | 57 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes (three to ten times in the month) | 15 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 4 | Often (more than ten times in the month) | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4491 |