Phase Five: Psychometric analysis (Criterion-Concurrent
Validity).
The criterion-concurrent validity was tested again, however, this phase
included using an objective measure (pharmacy refill records). A
retrospective audit was conducted; once the participants completed the
AAMQ, the researcher extracted their pharmacy refill records for the
previous eight months. The Medication Possession Ratio (MPR) was used to
express the patients’ pharmacy refill records (31). The MPR is the
percentage of time a patient has access to the medications. It was
calculated as the days’ supply of a medication in the particular time
period divided by the number of days from the first dispensing time to
the end of the defined time period. The research team considered that
the patient has consumed the medication if he dispensed it. Collection
of data from participants was reviewed by referring physicians to be
accurate.
The five study phases used to develop and validate the AAMQ are
illustrated in Figure 1.