| Value | Category | Cases | |
|---|---|---|---|
| 1 | Do not wash water container | 230 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    
| 2 | Once or twice per year | 216 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    
| 3 | Between one and three times per month | 898 | 
                                                                 
                                    
                                    29.2%
                                 
                                                             | 
                                                        
                    
| 4 | More than once per week | 1727 | 
                                                                 
                                    
                                    56.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 252 |