Fig. 5From: Determinants of vitamin B12 deficiency in patients with type-2 diabetes mellitus — A primary-care retrospective cohort studyMean “Metformin daily dose” by the “duration of type-2 diabetes mellitus” (with 95% confidence intervals; n = 592). This shows a strong linear association in bivariate regression (B = 0.113, F(1,590) = 99.74, P < 0.0001)Back to article page