In meta-regression, the WMD was not significantly associated with age (t = −0.26, p = 0.808), the proportion of males (t = −0.90, p = 0.39), publication year (t = 1.01, p = 0.33), study design (t = 1.38, p = 0.19), sample size (t = −0.40, p = 0.69), WBC (t = 0.79, p = 0.45), CRP (t = −1.62, p = 0.14), D-dimer (t = 0.71, p = 0.50), or history of diabetes (t = −0.84, p = 0.43), hypertension (t = −0.39, p = 0.71), and cardiovascular disease (t = −0.11, p = 0.92). Here, CRP is linked to Hypertension.