| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 814 | 
                                                                 
                                    
                                    53.9%
                                 
                                                             | 
                                                        
                    
| 2 | Rarely (once or twice in the month) | 564 | 
                                                                 
                                    
                                    37.4%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes (three to ten times in the month) | 111 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    
| 4 | Often (more than ten times in the month) | 20 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4491 |