CRP and COVID-19: Indeed, a meta-analysis evaluating a pool of 15,000 patients identified from 29 independent clinical studies demonstrated that diabetic COVID-19 patients showed higher levels of CRP (SMD 0.41 mg/L, 95% CI (0.21–0.60) mg/L) and concentration of D-Dimer (SMD 0.32 mg/L, 95% CI (0.17–0.47) mg/L) than the non-diabetic patients [43].