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Table 2 Theory of Planned Behaviour measures of belief and intention towards taking oral glucose-lowering medications

From: Protocol for SAMS (Support and Advice for Medication Study): A randomised controlled trial of an intervention to support patients with type 2 diabetes with adherence to medication

Variable name Number of items† Sample question
Direct attitude 2 It is beneficial for me to take my diabetes medicines without missing a day
Direct subjective norm (injunctive) 2 Most people who are important to me think I should take my diabetes medicines without missing a day
Direct subjective norm (descriptive) 1 If they were taking part in this study, most people who are important to me would take their diabetes medicines without missing a day
Direct perceived behavioural control 3 It is difficult for me to take my diabetes medicines without missing a day
Indirect attitude 7 If I were to take my diabetes medicines without missing a day, it would keep my diabetes under control
Indirect subjective norm (injunctive) 3 Members of my family or close relatives would approve of me taking my diabetes medicines without missing a day
Indirect perceived behavioural control 4 Changes to my daily routine would make it more difficult for me to take my diabetes medicines without missing a day
Intention 2 I intend to take my diabetes medicines without missing a day
  1. †Each measured on a 7-point scale from 1 = strongly disagree to 7 = strongly agree