Osteoporosis International

, Volume 14, Issue 10, pp 808–813

Adherence to bisphosphonates and hormone replacement therapy in a tertiary care setting of patients in the CANDOO database

Authors

  • Alexandra Papaioannou
    • Department of MedicineMcMaster University
    • Geriatric Medicine Hamilton Health Sciences
  • George Ioannidis
    • Department of MedicineMcMaster University
  • Jonathan D. Adachi
    • Department of MedicineMcMaster University
  • Rolf J. Sebaldt
    • Department of Clinical Epidemiology and Biostatistics,St Joseph's Health CareMcMaster University
  • Nicole Ferko
    • Clinical Health Sciences (Health Research Methodology Programme)McMaster University
  • Mark Puglia
    • Department of MedicineMcMaster University
  • Jacques Brown
    • Centre Hospitalier de l'Universite Laval
  • Alan Tenenhouse
    • Department of Clinical Epidemiology and Biostatistics,St Joseph's Health CareMcMaster University
  • Wojciech P. Olszynski
    • Department of MedicineUniversity of Saskatchewan
  • Pauline Boulos
    • Department of MedicineMcMaster University
  • David A. Hanley
    • Department of MedicineUniversity of Calgary
  • Robert Josse
    • University of Toronto
  • Timothy M. Murray
    • University of Toronto
  • Annie Petrie
    • Department of Clinical Epidemiology and Biostatistics,St Joseph's Health CareMcMaster University
  • Charlie H. Goldsmith
    • Department of Clinical Epidemiology and Biostatistics,St Joseph's Health CareMcMaster University
Original Article

DOI: 10.1007/s00198-003-1431-2

Cite this article as:
Papaioannou, A., Ioannidis, G., Adachi, J.D. et al. Osteoporos Int (2003) 14: 808. doi:10.1007/s00198-003-1431-2

Abstract

Therapies for osteoporosis must be taken for at least 1 year to be effective. The purpose of this study was to determine the difference in adherence to etidronate, alendronate and hormone replacement therapy in a group of patients seen at our tertiary care centres. The Canadian Database of Osteoporosis and Osteopenia (CANDOO), a prospective observational database designed to capture clinical data, was searched for patients who started therapy following entry into CANDOO. There were 1196 initiating etidronate, 477 alendronate and 294 hormone replacement therapy women and men aged (mean, SD) 65.8 (8.7) years in the study. A Cox proportional hazards regression model was used to assess differences between treatment groups in the time to discontinuation of therapy. Several potential covariates such as anthropometry, medications, illnesses, fractures and lifestyle factors were entered into the model. A forward selection technique was used to generate the final model. Hazard ratios and 95% confidence intervals (CI) were calculated. Adjusted results indicated that alendronate-treated patients were more likely to discontinue therapy as compared with etidronate-treated patients (1.404; 95% CI: 1.150, 1.714). After 1 year, 90.3% of patients were still taking etidronate compared with 77.6% for alendronate. No statistically significant differences were found between hormone replacement therapy and etidronate users (0.971; 95% CI: 0.862, 1.093) and hormone replacement therapy and alendronate users (0.824; 95% CI: 0.624, 1.088) after controlling for potential covariates. After 1 year, 80.1% of patients were still taking hormone replacement therapy, which decreased to 44.5% after 6 years. Increasing age and presence of incident non-vertebral fractures were found to be independent predictors of adherence. In conclusion, alendronate users were more likely to discontinue therapy than etidronate users over the follow-up period. Potential barriers to long-term patient adherence to osteoporosis therapies need to be evaluated.

Keywords

AdherenceBisphosphonatesHormone replacement therapyOsteoporosis

Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2003