| Value | Category | Cases | |
|---|---|---|---|
| 0 | measured | 2844 | 
                                                                 
                                    
                                    93.7%
                                 
                                                             | 
                                                        
                    
| 3 | not present | 68 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 4 | refused | 116 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 6 | other | 8 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 3445 |