The results, whether in combined analysis or separate comparisons, showed a trend of LNG-IUDs indicating small but statistically superior contraceptive efficacy compared to copper IUDs, despite the overall lower pregnancy rates (Cu-IUDs 2.0% and LNG-IUDs 0.3%).
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Contraception with levonorgestrel-releasing intrauterine system versus copper intrauterine device: a meta-analysis of randomized controlled trials.
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