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Normal ranges for bone loss rates

P D Ross1, Y F He, J W Davis

  • 1Hawaii Osteoporosis Center, Honolulu 96814.

Bone and Mineral
|August 1, 1994
PubMed
Summary
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Followup duration significantly impacts bone loss rate interpretations in postmenopausal women. Shorter followups may mask rapid bone loss, affecting clinical assessments of bone density changes.

Area of Science:

  • Osteoporosis research
  • Bone density measurement
  • Menopause studies

Background:

  • Bone loss rates in postmenopausal women exhibit decreasing variability over time.
  • Physical impairment risk is elevated in women with rapid bone loss.

Purpose of the Study:

  • To examine bone loss rate distributions at the calcaneus, distal radius, and proximal radius.
  • To establish age-specific normal ranges for bone loss rates.
  • To assess the influence of followup duration on normal range interpretation.

Main Methods:

  • Statistical analysis of bone loss rates from serial measurements.
  • Removal of extreme values to estimate normal bone loss distributions.
  • Calculation of 90% and 70% normal ranges for clinical use.

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Main Results:

  • Bone loss rate distributions were analyzed across different skeletal sites.
  • Normal ranges for bone loss rates were stratified by age group.
  • The width of normal ranges significantly decreased with longer followup durations (3-4 years vs. <1 year).

Conclusions:

  • Followup duration is a critical factor in interpreting bone loss rates.
  • Bone loss rates within normal limits at shorter followups may exceed normal limits later.
  • Clinical significance of measured bone loss rates depends heavily on followup duration.