title: A randomized comparative clinical evaluation of the Steel Ring, the VCu200 and the TCu220c IUDs.
abstract: A randomized comparative clinical study of the Steel Ring, VCu200 and TCu220c IUDs was carried out in Beijing. Six-hundred subjects were recruited and each group of 200 was inserted with one of the three devices. The TCu220c and the VCu200 had statistically significantly lower pregnancy and expulsion rates at one and two years of use than the Steel Ring. However, the Steel Ring consistently had the lowest rate of removal for pain and/or bleeding. At two years, the early differences of use-related discontinuation and continuation between the higher rates of the Steel Ring and the lower rates of the VCu200 and TCu220c were significantly reduced. There were no statistically significant differences of net event rates between VCu200 and TCu220c.
mesh_terms: D000328:Adult; D002681:China; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D007433:Intrauterine Device Expulsion; D007434:Intrauterine Devices / Q000009:adverse effects; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D011247:Pregnancy; D011897:Random Allocation