| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 386 | 
                                                                 
                                    
                                    25.6%
                                 
                                                             | 
                                                        
                    
| 2 | Rarely (once or twice in the month) | 853 | 
                                                                 
                                    
                                    56.5%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes (three to ten times in the month) | 204 | 
                                                                 
                                    
                                    13.5%
                                 
                                                             | 
                                                        
                    
| 4 | Often (more than ten times in the month) | 66 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4491 |