| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.8%
                                 | 
| 1 | Never | 6 | 
                                    
                                    5%
                                 | 
| 2 | Once a week | 33 | 
                                    
                                    27.3%
                                 | 
| 3 | Between 2 and 4 times a week | 20 | 
                                    
                                    16.5%
                                 | 
| 4 | Daily | 52 | 
                                    
                                    43%
                                 | 
| 5 | More than once a day | 9 | 
                                    
                                    7.4%
                                 | 
| Sysmiss | 834 |