A randomized muhicentre clinical comparative study of Stainless steel ring, VCu 200 and TCu 200c has been carried out in 23 centres in 13 provinces and municipalities. The experience of 6,236 cases was analyzed by lif...A randomized muhicentre clinical comparative study of Stainless steel ring, VCu 200 and TCu 200c has been carried out in 23 centres in 13 provinces and municipalities. The experience of 6,236 cases was analyzed by life table methods. The follow-up rate at the end of three years was 99.25%. Woman months of use of Steel ring, VCu 200 and TCu 220c were 54,366.5, 65,973.0 and 67,484.5 respectively. The cumulative continuation rate per 100 women at 36 months of use was 61.1, 78.1 and 80.2 respectively. The pregnancy rate was 5.2 and 5,3 per 100 respectively in cases of using TCu 220c and VCu 200, significantly lower than 17.6 per 100 in the ease of using Steel ring. The expulsion rate of TCu 220c at 36 months, 4.7 per 100, was the lowest; whereas the e,,cpulsion rate of Steel ring, 18.3 per 100, was the highest. However, the removal for bleeding and/or pain was 3.3 per 100 in Steelring, lower than 5.3 and 4.8per 100 in TCu 220c and VCu 200.展开更多
文摘A randomized muhicentre clinical comparative study of Stainless steel ring, VCu 200 and TCu 200c has been carried out in 23 centres in 13 provinces and municipalities. The experience of 6,236 cases was analyzed by life table methods. The follow-up rate at the end of three years was 99.25%. Woman months of use of Steel ring, VCu 200 and TCu 220c were 54,366.5, 65,973.0 and 67,484.5 respectively. The cumulative continuation rate per 100 women at 36 months of use was 61.1, 78.1 and 80.2 respectively. The pregnancy rate was 5.2 and 5,3 per 100 respectively in cases of using TCu 220c and VCu 200, significantly lower than 17.6 per 100 in the ease of using Steel ring. The expulsion rate of TCu 220c at 36 months, 4.7 per 100, was the lowest; whereas the e,,cpulsion rate of Steel ring, 18.3 per 100, was the highest. However, the removal for bleeding and/or pain was 3.3 per 100 in Steelring, lower than 5.3 and 4.8per 100 in TCu 220c and VCu 200.
