| Value | Category | Cases | |
|---|---|---|---|
| 0 | measured | 3929 | 
                                                                 
                                    
                                    92%
                                 
                                                             | 
                                                        
                    
| 3 | not present | 132 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    
| 4 | refused | 199 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    
| 6 | other | 9 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2212 |