Clinical efficacy analysis of mesenchymal stem cell therapy in patients with COVID-19: A systematic review

Figure 6 Forest plot for overall survival. The I² was 0%, and the fixed-effects model (Mantel-Haenszel method) was used in this analysis. Each trial is represented by a square, the center of which gives the odds ratios (OR) for that trial. The size of the square is proportional to the amount of information in that trial. The ends of the horizontal bars denote the 95%CI. The black diamond gives the overall OR for the combined results of all trials.