| Value | Category | Cases | |
|---|---|---|---|
| 1 | Flat | 2063 | 
                                    
                                    51.3%
                                 | 
| 2 | Slight slope | 1460 | 
                                    
                                    36.3%
                                 | 
| 3 | Moderate slope | 389 | 
                                    
                                    9.7%
                                 | 
| 4 | Steep, hilly | 111 | 
                                    
                                    2.8%
                                 | 
| Sysmiss | 19 |