| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. ONCE A YEAR | 40 | 
                                                                 
                                    
                                    47.6%
                                 
                                                             | 
                                                        
                    
| 2 | 2. ONCE IN EVERY TWO YEARS | 40 | 
                                                                 
                                    
                                    47.6%
                                 
                                                             | 
                                                        
                    
| 3 | 3. OTHERS | 4 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | .don't know | 0 | |
| Sysmiss | .qre refused | 0 | |
| Sysmiss | .refusal | 0 | |
| Sysmiss | .skip | 0 | |
| Sysmiss | 69 |