| Value | Category | Cases | |
|---|---|---|---|
| 1 | Calendar | 224 |
90.3%
|
| 2 | Body temperature | 7 |
2.8%
|
| 3 | Cervical mucus | 1 |
0.4%
|
| 4 | Body temp. & mucus | 5 |
2%
|
| 5 | No specific system | 8 |
3.2%
|
| 6 | Other | 3 |
1.2%
|