(can put more than one category, do not put individual method names)
- Sympto-hormonal (Marquette, Boston Cross Check, FEMM)
- Sympto-thermal (Sensiplan, SymptoPro, Couple to Couple League, NFPTA, Justisse, TCOYF)
- Mucus-only (Creighton and Billings)
(can put more than one category, do not put individual method names)