IL6 and COVID-19: The levels of serum ferritin (standardized mean difference (SMD): 0.47), C-reactive protein (SMD = 0.53), interleukin-6 (SMD = 0.3), fibrinogen (SMD = 0.31), and D-dimers (SMD = 0.54) were increased in diabetic COVID-19 cases compared to nondiabetic COVID-19 patients, signifying coagulation irregularities and inflammatory storm [15].