| Value | Category | Cases | |
|---|---|---|---|
| 1 | Everyday | 0 | 
                                
                                0%
                             | 
| 2 | Once a week | 2 | 
                                
                                0%
                             | 
| 3 | Once a month | 133 | 
                                
                                0.4%
                             | 
| 4 | Once a term | 852 | 
                                
                                2.4%
                             | 
| 5 | Once a year | 710 | 
                                
                                2%
                             | 
| 6 | Unspecified | 50 | 
                                
                                0.1%
                             | 
| 95 | Missing | 4 | 
                                
                                0%
                             | 
| 98 | Don't know | 3 | 
                                
                                0%
                             | 
| 99 | NA | 33435 | 
                                
                                95%
                             |