| Value |
Category |
| 1 |
Based on calendar |
| 2 |
Body temperature |
| 3 |
Cervical mucous |
| 4 |
Body temp and cervical mucous |
| 5 |
Cycle collar |
| 6 |
No system |
| 96 |
Other |
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.