Fig. 2From: Determinants of vitamin B12 deficiency in patients with type-2 diabetes mellitus — A primary-care retrospective cohort studyBox plot of Metformin daily dose (g/day) by age groups (n = 592). This shows the oldest age group (age ≥ 80 years) taking significantly less metformin daily than the youngest age group (age < 60 years) (P < 0.001); Age is thus a confounder in Metformin daily dose’s association with B12 deficiencyBack to article page