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Table 2 Outcome measures and timing of data collection

From: A single-blind randomised controlled trial of the effects of a web-based decision aid on self-testing for cholesterol and diabetes. study protocol

Construct Measures No. of items Questionnaire*
Primary outcomes    
   Knowledge Knowledge questionnaire based on information provided in the decision aid 20 Statements (True/false/don't know) 2
Secondary outcomes    
   Attitude Marteau [26] 4 1,2
   Ambivalence Felt ambivalence [24] 3 1,2
   Follow-up behaviour Uptake of self-tests, visiting a doctor, changing lifestyle. 7 3
   Intention Intention towards self-testing, seeing a doctor. 2 1,2,3
  Intention towards changing lifestyle 1 2,3
  Stages of change [27] 1 1,2,3
   Psychosocial determinants Perceived benefits and barriers 14 2
  Self-efficacy 3 2
  Response-efficacy 4 2
  Perceived susceptibility/risk perception [28] 3 1,2,3
  Cues to action 1 2
  Perceived severity 1 2
  Anticipated regret 1 2
  Moral obligation 2 2
  Subjective norm 1 2
  1. *Questionnaire 1: baseline. Questionnaire 2: directly after seeing intervention or control condition. Questionnaire 3: three months after viewing intervention or control condition