| Value | Category | Cases | |
|---|---|---|---|
| 1 | Calendar | 162 |
88%
|
| 2 | Body temperature | 4 |
2.2%
|
| 3 | Cervical mucus | 3 |
1.6%
|
| 4 | Body temp. & mucus | 8 |
4.3%
|
| 5 | No specific system | 4 |
2.2%
|
| 6 | Other | 3 |
1.6%
|