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.