| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 14 | 
                                    
                                    5.2%
                                 | 
| 2 | Every few weeks | 22 | 
                                    
                                    8.2%
                                 | 
| 3 | Every few months | 55 | 
                                    
                                    20.6%
                                 | 
| 4 | Not at all | 176 | 
                                    
                                    65.9%
                                 | 
| Sysmiss | 52 |