| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Impassable | 32 | 
                                    
                                    2.7%
                                 | 
| 2 | Very poor | 208 | 
                                    
                                    17.3%
                                 | 
| 3 | Poor | 192 | 
                                    
                                    16%
                                 | 
| 4 | Fair | 288 | 
                                    
                                    24%
                                 | 
| 5 | Good | 200 | 
                                    
                                    16.7%
                                 | 
| 6 | Very good | 280 | 
                                    
                                    23.3%
                                 |