POSTN and Prader-Willi syndrome: We observed positive correlations between OC (r = 0.651, ppartial = 0.005), Gla-OC (r = 0.576, ppartial = 0.016), and periostin (r = 0.786, ppartial < 0.001) concentrations and TBLH-BMC values in children with PWS.