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作者对洛杉矶某诊所12年期间(1965、5～1976、12)1468名初次放环者进行了研究。其中492 名妇女于1965年5月至1971年11月放置 Lippesloop,607名妇女于1970年6月至1974年8月放置达尔康盾形 IUD,369名妇女于1974年3月至1976年12月放置 Ca7 IUD。用生命表方法对三种 IUD进行比较表明置环24个月时达尔康盾形 IUD 脱落率显著低子 Lippes loop(P<0.05),Cu7 IUD脱落率与达尔康盾形 IUD 相似(P>0.1)。因出血及/或疼痛及盆腔感染性疾病(PID)取环率 Cu7IUD 显著高于达尔康盾形 IUD 与 Lippes loop(P<0.05),而达尔康盾形 IUD 又显著高于 Lip-pes loop(P<0.05)。Lippes loop 的连用率显
The author of a Los Angeles clinic in 12 years (1965,5 ~ 1976,12) 1468 initial release were studied. Of these, 492 women placed Lippesloop from May 1965 to November 1971, 607 women placed dalcon shield-shaped IUDs from June 1970 to August 1974, and 369 women from March 1974 to December 1976 Place Ca7 IUD. A comparison of the three IUDs with the life table method showed that dulcocon’s IUD shedding rate was significantly lower at the 24-month gemcitabine ring (P <0.05), and the Cu7 IUD shedding rate was similar to that of the dalconkoid IUD (P> 0.1 ). The loop rate Cu7IUD for hemorrhage and / or pain and pelvic infection (PID) was significantly higher than that for dalconium-shaped IUD and Lippes loop (P <0.05), while dalconkoid-shaped IUD was significantly higher than for Lip-pes loop P <0.05). The use of Lippes loop was significant