| Value | Category | Cases | |
|---|---|---|---|
| 1 | JUST BEFORE HER PERIOD BEGINS | 42 | 
                                    
                                    2%
                                 | 
| 2 | DURING HER PERIOD | 109 | 
                                    
                                    5.1%
                                 | 
| 3 | RIGHT AFTER HER PERIOD HAS ENDED | 422 | 
                                    
                                    19.6%
                                 | 
| 4 | HALFWAY BETWEEN TWO PERIODS | 45 | 
                                    
                                    2.1%
                                 | 
| 6 | OTHER | 8 | 
                                    
                                    0.4%
                                 | 
| 8 | DK | 46 | 
                                    
                                    2.1%
                                 | 
| Sysmiss | 1481 | 
                                    
                                    68.8%
                                 |