| Value | Category | 
                                    
                    
                        | 1 | Yes, at least some part of it on a regular basis | 
                                    
                    
                        | 2 | Yes, at least some part of it from time- to time | 
                                    
                    
                        | 3 | No | 
                                    
                    
                        | 4 | Don't know | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.