Fertility awareness affects method use.
D000569:Americas; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital; D003710:Demography; D019049:Developed Countries; D005193:Family Planning Services; D005298:Fertility; D006262:Health; D007434:Intrauterine Devices; D019359:Knowledge; D008598:Menstruation; D009656:North America; D010060:Ovulation; D011153:Population; D011157:Population Dynamics; D012098:Reproduction; D018456:Reproductive Medicine; D013245:Sterilization, Reproductive; D014481:United States
D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital
Americas; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Postcoital; Contraceptive Methods; Contraceptive Mode Of Action; Demographic Factors; Developed Countries; Family Planning; Family Planning, Behavioral Methods; Female Sterilization; Fertility; Health; Iud; Knowledge; Menstruation; Natural Family Planning; North America; Northern America; Ovulation; Population; Population Dynamics; Reproduction; Reproductive Health; Sterilization, Sexual; United States