Study design and questionnaire
hypertension, hyperlipidemia
HYPERTENSION, HYPERLIPIDEMIA
The DCE contains choice sets of pharmacy-based hypertension and/or hyperlipidemia management models. The maximum theoretical number of possible combinations of the levels and attributes is 324 (3The orthogonal design was preferred to minimize statistical error despite acknowledging the potential risk of including illogical combinations and becoming confusing for patients. Relative efficiency was measured using D-efficiency and the design had 93% efficiency.These 36 choice sets were allocated into nine blocks (questionnaires). We limited each to 4 choice sets per patient. A clinical scenario preceding choice sets was included to provide context to the decision-making. For each choice set, patients were asked to elicit their preferred choice of service from two alternative profiles (A or B). We used a non-labeled design. We did not include an opt-out alternative. An example of a choice set is presented in 