| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 150 | 
                                                                 
                                    
                                    90.4%
                                 
                                                             | 
                                                        
                    
| 2 | Once or twice | 12 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes | 2 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| 4 | Frequently | 2 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1092 |