| Value |
Category |
| 1 |
Based on calendar |
| 2 |
Based on body temperature |
| 3 |
Based on cervical mucus |
| 4 |
Based on Body Temp/mucus |
| 5 |
Other |
| 9 |
Unknown |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.