| Value | Category | Cases | |
|---|---|---|---|
| 0 | measured | 28 | 
                                                                 
                                    
                                    96.6%
                                 
                                                             | 
                                                        
                    
| 3 | not present | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 4 | refused | 1 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    
| 6 | other | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6452 |