Objectives
To estimate the prevalence and determinants of the use of potentially inappropriate medications (PIMs) in older U.S. adults using the 2012 Beers criteria.
Design
Retrospective cohort study in a random national sample of Medicare beneficiaries.
Setting
Fee-for-service Medicare beneficiaries from 2007 to 2012.
Participants
U.S. population aged 65 and older with Parts A, B, and D enrollment in at least 1 month during a calendar year (N = 38,250 individuals; 1,308,116 observations).
Measurements
The 2012 Beers criteria were used to estimate the prevalence of the use of PIMs in each calendar month and over a 12-month period using data on diagnoses or conditions present in the previous 12 months. Generalized estimating equations were used to account for the dependence of multiple monthly observations of a single person when estimating 95% confidence intervals (CIs), and logistic regression was used to identify independent determinants of PIM use.
Results
The point prevalence of the use of PIMs decreased from 37.6% (95% CI = 37.0–38.1) in 2007 to 34.2% (95% CI = 33.6–34.7) in 2012, with a statistically significant 2% (95% CI = 1–3%) decline per year assuming a linear trend. The 1-year period prevalence declined from 64.9% in 2007 to 56.6% in 2012. The strongest predictor of PIM use was the number of drugs dispensed. Individuals aged 70 and older and those seen by a geriatrician were less likely to receive a PIM.
Conclusion
From 2007 to 2012, the prevalence of PIM use in older U.S. adults decreased according to the 2012 Beers criteria, although it remains high, still affecting one-third each month and more than half over 12 months. The number of dispensed prescriptions could be used to target future interventions.
from Journal of the American Geriatrics Society http://ift.tt/1VEcpZB
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