| Value | Category | Cases | |
|---|---|---|---|
| -888 | Other: specify | 2 | 
                                    
                                    1.8%
                                 | 
| 1 | Daily | 8 | 
                                    
                                    7.1%
                                 | 
| 2 | Once a week | 20 | 
                                    
                                    17.7%
                                 | 
| 3 | Twice a month | 19 | 
                                    
                                    16.8%
                                 | 
| 4 | Monthly | 51 | 
                                    
                                    45.1%
                                 | 
| 5 | As necessary | 13 | 
                                    
                                    11.5%
                                 | 
| Sysmiss | 18 |