Figure 2. Mediation effects of serum valine, glutamic acid and histidine on the association between the AACI and incidence of type 2 diabetes in the HPHS (A) and HDNNCDS (B). AACI, dietary amino acids composition index; β, the standardised regression coefficients; † P<0.05 for the coefficients being different from 0. HPHS, Harbin People health Study; HDNNCDS, the Harbin Cohort Study on Diet, Nutrition and Chronic Noncommunicable Disease.