| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 1 | Annually | 10 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    
| 2 | Biannually/Every six months | 6 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    
| 3 | Quarterly | 15 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    
| 4 | Monthly | 213 | 
                                                                 
                                    
                                    82.9%
                                 
                                                             | 
                                                        
                    
| 5 | Weekly | 5 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 6 | Daily | 7 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    
| 7 | Hourly | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 8 | More than once in an hour | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 324 |