medMPR {medAdherence}R Documentation

Medication Possession Ratio

Description

medMPR function calculates the medication possession ratio.

Medication Possession Ratio (MPR) were computed taking the ratio of the sum of days' supplies to number of days in study (important: the first day in study is not necessary a prescription refill date).

The ratio alone can't be combined across patients due to different observation days (denomitor). MPR may exceed 100% due to early refills and/or polypharmacy. Very commonly, if MPR>100%, it will be truncated to 100%.

Usage

medMPR(df=data, followUpDays=NA,truncated="yes")

Arguments

df a dataframe created by preData funtion
followUpDays days of follow up
truncated limit MPR to 100% or not. "yes" is the default

Author(s)

Xiangyang Ye, Pharmacotherapy Outcomes Research Center, University of Utah

References

Skaer TL, Sclar DA, et al. Effect of Pharmaceutical Formulation for Diltiazem on Health Care Expenditures fo Hypertension Clinical Therapeutics 1993;15:905-911

Hess, LM, Raebel, MA, et al. Measurement of Adherence in Pharmacy Administrative Databases: A Proposal for Statndard Definitions and Preferred Measures The Annals of Pharmacotherapy 2006;40:1280-1288

Examples

data(cmos)
predt <- preRxData(df=cmos,id=ptid,rxDate=rxDay,daySupply=supplies)
medMPR(predt)

[Package medAdherence version 1.01 Index]