FGF23 and abnormal mineralization disorder: However, in analyses adjusting for age and the GFR-cys-creat, two relevant confounders for the link between SDMA and bone mineral disorder biomarkers, all these associations failed to maintain an independent association with SDMA [Phosphorus-SDMA β = 0.001, P = 0.99; PTH-SDMA β = 0.178, P = 0.06; 1,25-(OH)2 Vit D-SDMA β = -0.055, P = 0.54; FGF23-SDMA β = 0.135, P = 0.11].