Journal of evaluation in clinical practice
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Randomized Controlled Trial
Randomized trial within a trial of yellow 'post-it notes' did not improve questionnaire response rates among participants in a trial of treatments for neck pain.
Attrition is a threat to the validity of randomized trials. Few randomized studies have been conducted within randomized trials to test methods of reducing attrition. ⋯ Yellow post-it notes do not enhance questionnaire return rates for participants in a randomized trial of neck pain.