| Value | Category | Cases | |
|---|---|---|---|
| -888 | Other: specify | 2 | 
                                    
                                    1.6%
                                 | 
| 1 | Daily | 2 | 
                                    
                                    1.6%
                                 | 
| 2 | Once a week | 5 | 
                                    
                                    4.1%
                                 | 
| 3 | Twice a month | 11 | 
                                    
                                    8.9%
                                 | 
| 4 | Monthly | 100 | 
                                    
                                    81.3%
                                 | 
| 5 | As necessary | 3 | 
                                    
                                    2.4%
                                 | 
| Sysmiss | 8 |