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Table 4 Relative changes of mean QUS parameters in postmenopausal groups with respect to control group (%)

From: The effect of physical loading on calcaneus quantitative ultrasound measurement: a cross-section study

  Group 0 Group 1 Group 2 Group 3
relative changes of mean speed of sound
  Δwl_SOS 1.42 1.76 2.40
  Δl_SOS 1.67 1.88 2.71
  Δwn_SOS 21.24 20.71 17.28
relative changes of mean normalized broadband ultrasound attenuation
  Δwl_nBUA 21.88 30.46 39.68
  Δl_nBUA 22.58 29.04 40.39
  Δwn_nBUA 35.90 41.03 48.72
relative changes of mean stiffness index
  Δwl_STI 16.91 17.15 36.61
  Δl_STI 18.54 24.12 35.35
  Δwn_STI 34.30 37.79 45.35
  1. The prefixes ‘l_’, ‘wl_’ and ‘wn_’ mean “loading”, “without loading” and “weight-normalized”, respectively.