Contraceptives, Oral, Combined/pharmacology; Ethinyl Estradiol/pharmacology; Menstrual Cycle/drug effects; Norgestrel/analogs & derivatives; Adolescent; Adult; Dysmenorrhea/prevention & control; Ethinyl Estradiol/administration & dosage; Ethinyl Estradiol/adverse effects; Female; Humans; Norgestrel/administration & dosage; Norgestrel/adverse effects; Norgestrel/pharmacology; Patient Compliance; Premenstrual Syndrome

Americas; Bleeding; Clinical Research; Clinical Trials; Contraception; Contraceptive Agents; Contraceptive Agents, Estrogen; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods--side effects; Contraceptive Usage; Data Collection; Demographic Factors; Developed Countries; Diseases; Ethinyl Estradiol; Family Planning; Incidence; Measurement; Menstrual Cycle--changes; Menstruation; Method Acceptability; Metrorrhagia; Norgestimate; North America; Northern America; Oral Contraceptives, Combined--side effects; Oral Contraceptives, Phasic--side effects; Oral Contraceptives--side effects; Population; Reproduction; Research Methodology; Signs And Symptoms; United States