Figure 4. Forest plot for the BPs’ role in the prevention of bone metastasis of breast cancer in the perimenopausal period. Square markers indicate effect sizes of each study; horizontal lines, the 95% CI. The diamond data marker indicates the summarized effect size.

BP = bisphosphonate; CI = confidence interval; HR = hazard ratio; SE = standard error; IV = generic inverse variance method; RCT = randomized controlled trial.