| Value | Category | Cases | |
|---|---|---|---|
| 1 | Calendar | 881 |
84.8%
|
| 2 | Body temperature | 51 |
4.9%
|
| 3 | Cervical mucus | 26 |
2.5%
|
| 4 | Body temp. & mucus | 40 |
3.8%
|
| 5 | No specific system | 21 |
2%
|
| 6 | Other | 20 |
1.9%
|