| Value | Category | 
                                    
                    
                        | 1 | Cannot read at all | 
                                    
                    
                        | 2 | Able to read only part of the sentece | 
                                    
                    
                        | 3 | Able to read whole sentence | 
                                    
                    
                        | 4 | No card with required languaje | 
                            
            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.