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Figure 2: BDRs at different skeletal sites in native Chinese women displayed by quartiles of serums OPG, TGF-β1, and TGF-β2 concentrations. OPG: osteoprotegerin, TGF-β: transforming growth factor-beta, Q1: first quartile, Q2: second quartile, Q3: third quartile, Q4: fourth quartile, PA: posteroanterior spine, BDR: bone mineral density decreased rate, FN: femoral neck, Hip: total hip, and RUUD: radius + ulna ultradistal. –0.000 compared with Q3 and Q4; –0.000 compared with Q3.