Figure 4. Two-sample Mendelian randomization heterogeneity test results. (A) The funnel plot for rib-sternum-thoracic spine fractures exhibited a symmetric distribution. (B) The 'Leave-one-out' sensitivity test confirmed the robustness of the rib-sternum-thoracic spine fracture results. (C) Similarly, the funnel plot for lumbar spine-pelvis fractures showed symmetry. (D) The 'Leave-one-out' sensitivity test for lumbar spine-pelvis fractures validated the stability of these findings.