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The loop, shown to be the most efficient intra-uterine contraceptive device, appears to be almost as effective as oral contraceptives.
Two New York State physicians reported separate studies with intra-uterine contraceptive devices (IUCDs) at the meeting in Chicago of the American Association of Planned Parenthood Physicians.
Four types of the most widely used IUCDs in the United States— the plastic coil, the loop, bow, and stainless steel ring—were used in a two-year study of 2,330 women by Robert E. Hall, MD, Columbia University's College of Physicians and Surgeons. "Evidence thus far suggests," he stated, "that the loop is superior to the other designs." ( See related story).
"The device provided successful, uncomplicated contraception 79% of the time during the first most difficult year of use. This figure is thought to be roughly comparable to that among women using oral contraceptives."
The incidence of undesirable side effects and expulsions was too high
Loop Device Reported Equal of Oral Contraceptives. JAMA. 1965;192(10):39–44. doi:10.1001/jama.1965.03080230149054