| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0 not used at all | 424 | 
                                                                 
                                    
                                    27.9%
                                 
                                                             | 
                                                        
                    
| 1 | 1 | 121 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 141 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 3 | 3 | 111 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    
| 4 | 4 | 66 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    
| 5 | 5 | 92 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    
| 6 | 6 | 34 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 7 | 7 | 25 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 8 | 8 | 35 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    
| 9 | 9 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 10 | 10 used a lot | 8 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 98 | 98 don't know | 5 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 99 | 99 no answer | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 453 | 
                                                                 
                                    
                                    29.8%
                                 
                                                             |