| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. None | 0 | 
                                    
                                    0%
                                 | 
| 2 | 2. One | 6 | 
                                    
                                    6.9%
                                 | 
| 3 | 3. Two | 14 | 
                                    
                                    16.1%
                                 | 
| 4 | 4. Three or more | 67 | 
                                    
                                    77%
                                 | 
| Sysmiss | 12 |