| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 4 | 
                                    
                                    4.2%
                                 | 
| 2 | Every few weeks | 18 | 
                                    
                                    18.9%
                                 | 
| 3 | Every few months | 50 | 
                                    
                                    52.6%
                                 | 
| 4 | Not at all | 23 | 
                                    
                                    24.2%
                                 | 
| Sysmiss | 27 |