Effect of Extended 30 mu g Ethinyl Estradiol with Continuous Low-Dose Ethinyl Estradiol and Cyclic 20 mu g Ethinyl Estradiol Oral Contraception on Adolescent Bone Density: A Randomized Trial

摘要

Study Objective: To compare changes in lumbar spine bone mineral density after 12 months of a 91-day extended regimen or 28-day combined oral contraceptive with those in a healthy reference group not using hormonal contraceptives.