| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Increased | 1 | 
                                    
                                    0.6%
                                 | 
| 2 | Remained the same | 158 | 
                                    
                                    94%
                                 | 
| 3 | Decreased | 9 | 
                                    
                                    5.4%
                                 | 
| Sysmiss | 74 |