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Table 3 Patient questionnaire subscales with mean scores and reliability estimates (Cronbach’s alpha)

From: Preliminary development of a questionnaire measuring patient views of participation in clinical trials

Subscale No. of items Score range (min–max) Pilot study Final study
Mean (SD) Cronbach’s alpha Mean (SD) Cronbach’s alpha
Motivation 9 (9–36) 34.70 (2.52) 0.85 34.20 (3.88) 0.92
Risks 5 (5–20) 19.09 (2.10) 0.85 18.73 (2.49) 0.83
Understanding trial purpose 3 (3–12) 11.81 (0.62) 0.67 11.49 (1.45) 0.83
Benefits 3 (3–12) 11.68 (0.78) 0.78 11.40 (1.53) 0.85
Cost and convenience 4 (4–16) 13.98 (2.07) 0.62 13.58 (2.87) 0.78
Contribution to health 3 (3–12) 11.38 (1.04) 0.67 11.60 (1.38) 0.96
Total number of items 27