| Value | Category | Cases | |
|---|---|---|---|
| 1 | Calendar | 322 |
88.5%
|
| 2 | Body temperature | 10 |
2.7%
|
| 3 | Cervical mucus | 7 |
1.9%
|
| 4 | Body temp. & mucus | 11 |
3%
|
| 5 | No specific system | 7 |
1.9%
|
| 6 | Other | 7 |
1.9%
|