With the adjustment for BMI and age at examination the ghrelin concentrations in T2DM and both MODY groups had similar pattern but the differences were reduced by approximately 50 % as compared with crude estimates (p = 0.007, and p = 0.005 for HNF1A–MODY and GCK–MODY, accordingly). The gene discussed is HNF1A; the disease is type 2 diabetes mellitus.