| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 20 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 1 | Rarely (once or twice a month) | 75 | 
                                                                 
                                    
                                    6%
                                 
                                                             | 
                                                        
                    
| 2 | Sometimes (three or four times a month) | 104 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    
| 3 | Often (more than 6 times per month) | 565 | 
                                                                 
                                    
                                    45.5%
                                 
                                                             | 
                                                        
                    
| 4 | Always (every day) | 477 | 
                                                                 
                                    
                                    38.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2 |