Effect Estimates of type 2 diabetes according to ferritin levels and dietary iron intake in all 16 studies for the meta-analysis.

aQuartile 4 vs 1–3 serum ferritin.
bEffect estimates used in the main analysis. CI, confidence interval; HR, hazard ratio; OR, odds ratio; RR, relative risk; BMI, body mass index; HDL-C, high-density lipoprotein cholesterol; AST, aspartate aminotransferase; ALT, alanine transaminase; GGT, gamma-glutamyl transpeptidase; hsCRP, high sensitivity C-reactive protein; sTRF, serum transferrin receptor-ferritin; IL-6, Interleukin-6; WHR, waist-hip ratio.