Meta-analysis of randomized control trials of therapeutic heparin in hospitalized noncritically ill patients with COVID-19. Odds ratios of 3 trials^11-13 were combined with Mantel-Haenszel fixed-effect meta-analyses. Treatment effects are represented by squares with area proportional to the trial weight with 95% confidence interval shown by horizontal lines. Diamonds show the meta-analyses treatment effect estimates. Reproduced with permission from Research and Practice in Thrombosis and Haemostasis.¹⁴