| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 15 | 
                                    
                                    5.5%
                                 | 
| 2 | Every few weeks | 27 | 
                                    
                                    10%
                                 | 
| 3 | Every few months | 98 | 
                                    
                                    36.2%
                                 | 
| 4 | Not at all | 131 | 
                                    
                                    48.3%
                                 | 
| Sysmiss | 48 |