| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.Several times a day | 0 | 
                                
                                0%
                             | 
| 2 | 2.Once a day | 2 | 
                                
                                0.9%
                             | 
| 3 | 3.Several times a week | 2 | 
                                
                                0.9%
                             | 
| 4 | 4.Once a week | 2 | 
                                
                                0.9%
                             | 
| 5 | 5.less than once a month | 17 | 
                                
                                8%
                             | 
| 6 | 6.Never | 189 | 
                                
                                88.7%
                             | 
| 95 | 95.Missing | 1 | 
                                
                                0.5%
                             | 
| 96 | 96.Other | 0 | 
                                
                                0%
                             |