| Value | Category | Cases | |
|---|---|---|---|
| 1 | Everyday | 26 | 
                                
                                0.1%
                             | 
| 2 | Once a week | 36 | 
                                
                                0.1%
                             | 
| 3 | Once a month | 958 | 
                                
                                2.7%
                             | 
| 4 | Once a term | 18540 | 
                                
                                52.7%
                             | 
| 5 | Once a year | 2310 | 
                                
                                6.6%
                             | 
| 6 | Unspecified | 2115 | 
                                
                                6%
                             | 
| 95 | Missing | 27 | 
                                
                                0.1%
                             | 
| 98 | Don't know | 36 | 
                                
                                0.1%
                             | 
| 99 | NA | 11141 | 
                                
                                31.7%
                             |