The rate of success or failure of a method of CONTRACEPTION; CONTRACEPTIVE AGENTS; or CONTRACEPTIVE DEVICES.
Also Known As:
Birth Control Effectiveness; Birth Control Failure; Contraception Failure; Contraceptive Failure; Birth Control Failures; Contraception Failures; Contraceptive Failures; Control Failure, Birth; Control Failures, Birth; Effectiveness, Birth Control; Effectiveness, Contraceptive; Failure, Birth Control; Failure, Contraception; Failure, Contraceptive; Failures, Birth Control; Failures, Contraception; Failures, Contraceptive