Factor 1: Expectation of pharmacological efficacy (α = 0.829)

I believe medication is effective.

I trust the doctor who prescribes my medication.

I am serious about taking medication.

I think medication is important.

I take it so my condition won’t get worse.

I expect the medication to have an effect.

I always try to take it when the time comes round.

I take it in the way the doctor told me to.

I am accustomed to taking medication.

0.675

0.662

0.644

0.642

0.606

0.590

0.577

0.546

0.535

0.067

0.027

−0.085

0.045

−0.068

−0.028

0.249

−0.153

0.034

−0.102

−0.158

0.035

0.025

0.171

0.187

0.010

0.009

0.031

Factor 2: Motivation to be self-controlled in taking medication (α = 0.743)

I make my own decision as to whether or not to take my medication.

I choose for myself which medication I want to take.

Even if I ask medical professionals a question about medication, they won’t answer me.

I don’t know why I’m taking medication.

Even if you are unable to take medication properly, that’s all right.

I’m taking medication even though I don’t know what effect it has.

0.180

0.217

−0.118

−0.220

−0.174

−0.129

0.675

0.671

0.528

0.523

0.467

0.442

−0.116

−0.131

0.128

0.079

0.044

0.071

Factor 3: Negative feelings about taking medication (α = 0.689)

I want to stop taking medication.

If possible, I would prefer not to take medication.

I am worried about the possible side effects of medication.

I am concerned about the efficacy of medication.

−0.125

0.087

0.027

0.290

−0.067

−0.188

0.248

0.084

0.660

0.607

0.457

0.434