A mathematical model study of contraceptive efficiency and unplanned pregnancies.
D000367:Age Factors; D003267:Contraception; D003273:Contraceptive Devices; D003276:Contraceptives, Oral; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D007434:Intrauterine Devices; D008297:Male; D008962:Models, Theoretical; D013245:Sterilization, Reproductive; D014481:United States
D003276:Contraceptives, Oral