By contrast, no significant correlations were observed with age (t=​0.66, p​=0.51), sex (t​=​-1.26, p=0.21), publication year (t=0.35, p​= 0.73), study design (t​=0.04, p=​0.97), sample size (t=1.11, 0.27), C-reactive protein (t=1.73, p​=0.10), ferritin (t=0.87, p=0.41), and history of diabetes (t​=​-0.16, p=0.88), hypertension (t​=0.12, p​=0.90), or cardiovascular disease (t​=-0.33, p=0.74). Here, CRP is linked to diabetes mellitus.