Meta-analyses of one-year continuation rates comparing ESI with LNG-IUS and copper-IUD. a, b Show the effect size for one year continuation rates for ESI compared to LNG-IUS and Copper-IUD respectively. The square boxes represent effect size of individual studies. The area of the square represents the weight of the study. The horizontal lines represent the limits of 95% confidence interval of the effect sizes. The vertical line is at 1, where there is no difference in continuation rates in the two methods. The diamond shape at the bottom of the plots represents the pooled odds ratio. In both cases it shows that continuation rates are lower in ESI.