Table 3: The quantitative ultrasound scan parameters of the calcaneus stratified by age groups and gender (N=450).

Variables Gender
Female Male
Age group BUA (dB/MHz) SOS
(m/s) 		SI % eBMD
(g/cm2) 		BUA
(dB/MHz) 		SOS
(m/s) 		SI % eBMD
(g/cm2)
>45 years 78.96±15.50 1516.84±15.57 57.62±14.04 0.45±0.08 77.35±21.81 1520.10±20.83 57.45±19.78 0.45±0.11
45-54 years 70.92±14.69 1519.98±14.82 53.11±13.34 0.43±0.07 70.68±14.81 1514.99±14.69 51.56±13.09 0.42±0.07
55-64 years 62.13±14.05 1511.87±12.79 44.95±12.37 0.39±0.07 70.18±15.92 1516.58±14.96 51.66±14.03 0.43±0.07
≥65 years 62.14±12.48 1510.94±12.74 44.69±10.92 0.39±0.06 68.32±16.53 1514.21±14.44 49.76±14.38 0.41±0.08
Total 64.52±14.22 1513.35±13.69 46.96±12.59 0.40±0.07 69.54±16.11 1515.35±14.74 50.89±14.12 0.42±0.07

BUA, broadband ultrasound attenuation; SOS, speed of sound; SI, stiffness index; eBMD, estimated bone mineral density.
Values are shown as mean± standard deviation (M± SD).