| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1384 | 
                                                                 
                                    
                                    91.7%
                                 
                                                             | 
                                                        
                    
| 2 | Rarely (once or twice in the month) | 102 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes (three to ten times in the month) | 20 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 4 | Often (more than ten times in the month) | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4491 |