| Value | Category | Cases | |
|---|---|---|---|
| -9 | 3560 | 
                                
                                90.1%
                             | |
| 0 | No | 232 | 
                                
                                5.9%
                             | 
| 1 | Yes | 140 | 
                                
                                3.5%
                             | 
| 3 | Not aware of OBA voucher | 16 | 
                                
                                0.4%
                             | 
| 9 | Not applicable | 4 | 
                                
                                0.1%
                             |