For all residents, the computerized drug dispensing histories contain data concerning the dispensed drug, prescriber specialty, dispensing date, dispensed amount, prescribed dose regimens, and the legend duration of use (prescription length).
Clopidogrel use was assessed using the Veterans Health Administration Pharmacy Benefits Management database, which records the date dispensed and the number of days supplied for each dispensed medication.
The computerised medication-dispensing histories contain data regarding dispensed medications, type of prescriber, dispensing date, dispensed amount of medication, prescribed dosage and length of prescription.
The prescription database contains information on dispensed outpatient prescription medications including drug name, dosage and amount dispensed, date dispensed and prescribed number of days of treatment.
This captures all prescription drugs dispensed, with information on date dispensed, dose, and days of supply.
Each pharmacy record includes a patient identifier, the drug type and dose, date dispensed, quantity dispensed, and dosing instructions.
Information on dispensing including anatomical therapeutical chemical (ATC) code, date dispensed, and days' supply was obtained from the PHARMO Database Network.
^refers to whether the timing of the dispensing (actual date dispensed) is taken into account in the calculations or is ignored.
The proportion of missing or out-of-range answers in terms of key fields, including drug names, quantity, date dispensed and duration, comprised <0.5% of the records.
* Variables without association, and therefore not used as predictors in this model, are: date dispensed, PCP prescribing volume with this insurer, patients' average pharmaceutical claims per month, and patient race and income (as estimated from zip code data).
