European Journal of Clinical Pharmacology

, Volume 69, Issue 7, pp 1477–1483

Geographical differences in the prevalence of chronic polypharmacy in older people: eleven years of the EPIFARM-Elderly Project

Authors

    • Laboratory for Quality Assessment of Geriatric Therapies and ServicesIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Massimo Cartabia
    • Laboratory of Mother and Child HealthIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Paolo Risso
    • Laboratory of Epidemiology and Social PsychiatryIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Daniela Mari
    • IRCCS Maggiore Hospital Foundation and University of Milan, Department of Clinical Sciences and Community Health, Geriatric Unit
  • Mauro Tettamanti
    • Laboratory of Geriatric NeuropsychiatryIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Alberto Parabiaghi
    • Laboratory of Epidemiology and Social PsychiatryIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Luca Pasina
    • Laboratory for Quality Assessment of Geriatric Therapies and ServicesIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Codjo Djignefa Djade
    • Laboratory for Quality Assessment of Geriatric Therapies and ServicesIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
  • Ida Fortino
    • Regional Health Ministry, Lombardy Region
  • Angela Bortolotti
    • Regional Health Ministry, Lombardy Region
  • Luca Merlino
    • Regional Health Ministry, Lombardy Region
  • Alessandro Nobili
    • Laboratory for Quality Assessment of Geriatric Therapies and ServicesIstituto di Ricerche Farmacologiche Mario Negri-IRCCS
Pharmacoepidemiology and Prescription

DOI: 10.1007/s00228-013-1495-7

Cite this article as:
Franchi, C., Cartabia, M., Risso, P. et al. Eur J Clin Pharmacol (2013) 69: 1477. doi:10.1007/s00228-013-1495-7

Abstract

Purpose

To compare the geographical differences in the prevalence of chronic polypharmacy in community-dwelling older people over 11 years.

Methods

This study analyzed nearly two million patients aged 65–94 years recorded in the Drug Administrative Database of the Lombardy Region (Northern Italy) from 2000 to 2010. Chronic polypharmacy was defined as taking five or more drugs in 1 month for at least 6 months (consecutive or not) in a year.

Results

There was a significant spatial autocorrelation that increased at the municipality level from 2000 (Moran’s I Index = 0.26, z score = 16.91, p < 0.0001) to 2010 (Moran’s I Index = 0.36, z score = 23.78, p < 0.0001). Clusters of high (Z(G) > 1.96) and low (Z(G) < −1.96) prevalence rates of chronic polypharmacy were found and were not influenced by age. Chronic polypharmacy weakly correlated with hospital admission (2000: ρ = 0.08, p = 0.0032; 2005: ρ = 0.11, p < 0.0001; 2010: ρ = 0.18, p < 0.0001), but not with mortality.

Conclusions

There were geographical differences in the prevalence of older people with chronic polypharmacy that were only partly explained by health indicators. Targeted activities on prescription practice to ensure that the prescribing of chronic polypharmacy is appropriate are required.

Keywords

Older peopleChronic polypharmacyGeographical differenceClusters

Copyright information

© Springer-Verlag Berlin Heidelberg 2013