| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.8%
                                 | 
| 1 | Never | 2 | 
                                    
                                    1.7%
                                 | 
| 2 | Once a week | 28 | 
                                    
                                    23.1%
                                 | 
| 3 | Between 2 and 4 times a week | 29 | 
                                    
                                    24%
                                 | 
| 4 | Daily | 44 | 
                                    
                                    36.4%
                                 | 
| 5 | More than once a day | 17 | 
                                    
                                    14%
                                 | 
| Sysmiss | 834 |