Wong and his associates calculated a medication possession ratio
based on the frequency at which a patient's records documented receiving an injection, and the number of days the injection covered during follow-up.
Researchers have developed the medication possession ratio
(MPR), which is often defined as the number of days of medication dispensed as a percentage of time, such as 365 days.
The investigators measured adherence using a metric called the medication possession ratio
(MPR), defined as the amount of medication filled divided by the amount needed to fill to take as prescribed.
The study confirmed that patients need to achieve a medication possession ratio
(MPR) of at least 80% (meaning that they are adherent to 80% or more of their prescription medications) in order to reduce their risk of hospital readmission after a heart attack.
The children's mean medication possession ratio
, a measure of adherence, was 0.
The model included age, gender, employee (versus spouse), pre-period medication continuation as measured by the medication possession ratio
Patients who received automated IVR telephone reminders had a significantly higher medication possession ratio
compared with patients who did not receive reminders.
Patients with an Medication Possession Ratio
over 80 are considered "optimally adherent".