| Value | Category | Cases | |
|---|---|---|---|
| 1 | BLANK WATER SAMPLE AVAILABLE | 1668 | 
                                    
                                    99.2%
                                 | 
| 2 | BLANK WATER SAMPLE NOT AVAILABLE | 12 | 
                                    
                                    0.7%
                                 | 
| 9 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 18839 |