Figure 2

Forest plot for 30 studies of the association between tubal ligation and ovarian cancer risk. Forest plot summarizing individual effect estimates from 30 studies [9–37] contributing to summary effect estimates describing the association between tubal ligation and ovarian cancer risk. Black boxes mark the effect estimate for individual studies and the size of the black boxes represent the weight of individual studies in the summary estimate; horizontal gray lines demonstrate the width of the 95%CIs associated with each individual study; the black diamonds represent summary effect estimates; stars indicate pooled studies.