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全国13省、市共23个单位,对不锈钢金属单环、V铜200及T铜220c共6,236例对象进行了随机化临床多中心比较性研究。采用生命表统计分析方法进行评价。三年末的随访率为99.25%。金属单环、Vcu200和Tcu220c的使用妇女月各为54,366.5、65,973.0和67,484.5。36个月时每百妇女累积续用率分别为61.1,78.1和8O.2。Tcu220c和Vcu200的每百妇女妊娠
A total of 6,236 subjects, including stainless steel single-ring, V-copper 200 and T-copper 220c, were randomized clinical multi-center comparative studies in 23 units in 13 provinces and cities nationwide. Using life table statistical analysis method for evaluation. The three-year follow-up rate was 99.25%. The cumulative utilization rates of metal monocyclic, Vcu200 and Tcu220c women at 54,366.5,65,973.0 and 67,484.5.36 months per woman were 61.1, 78.1 and 80.2, respectively. Tcu220c and Vcu200 pregnancy per 100 women