| Value | Category | Cases | |
|---|---|---|---|
| 1 | During her period | 8 | 
                                                         
                                
                                0.1%
                                                             
                                                     | 
                                            
| 2 | After period ended | 1187 | 
                                                         
                                
                                19.4%
                                                             
                                                     | 
                                            
| 3 | Middle of the cycle | 2939 | 
                                                         
                                
                                48.1%
                                                             
                                                     | 
                                            
| 4 | Before period begins | 184 | 
                                                         
                                
                                3%
                                                             
                                                     | 
                                            
| 5 | At any time | 153 | 
                                                         
                                
                                2.5%
                                                             
                                                     | 
                                            
| 6 | Other | 5 | 
                                                         
                                
                                0.1%
                                                             
                                                     | 
                                            
| 8 | Don't know | 1640 | 
                                                         
                                
                                26.8%
                                                             
                                                     |