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Background  Patient understanding of study information is fundamental to gaining informed consent to take part in a randomised controlled trial. In order to meet the requirements of research ethics committees, patient information materials can be long and need to communicate complex messages. There is concern that standard approaches to providing patient information may deter potential participants from taking part in trials. The Systematic Techniques for Assisting Recruitment to Trials (MRC-START) research programme aims to test interventions to improve trial recruitment. The aim of this study was to investigate the effect on recruitment of optimised patient information materials (with improved readability and ease of comprehension) compared with standard materials. The study was embedded within two primary care trials involving patients with long-term conditions.    Methods  The  Healthlines  Study involves two linked trials evaluating a telehealth intervention in patients with depression ( Healthlines Depression ) or raised cardiovascular disease risk ( Healthlines CVD ). We conducted two trials of a recruitment intervention, embedded within the  Healthlines  host trials. Patients identified as potentially eligible in each of the  Healthlines  trials were randomised to receive either the original patient information materials or optimised versions of these materials. Primary outcomes were the proportion of participants randomised ( Healthlines Depression ) and the proportion expressing interest in taking part ( Healthlines CVD ).    Results  In  Healthlines Depression  (n = 1364), 6.3 % of patients receiving the optimised patient information materials were randomised into the study compared to 4.0 % in those receiving standard materials (OR = 1.63, 95 % CI = 1.00 to 2.67). In  Healthlines CVD  (n = 671) 24.0 % of those receiving optimised patient information materials responded positively to the invitation to participate, compared to 21.9 % in those receiving standard materials (OR = 1.12, 95 % CI = 0.78 to 1.61).    Conclusions  Evidence from these two embedded trials suggests limited benefits of optimised patient information materials on recruitment rates, which may only be apparent in some patient populations, with no effects on other outcomes. Further embedded trials are needed to provide a more precise estimate of effect, and to explore further how effects vary by trial context, intervention, and patient population.    Trial registration  Current Controlled Trials:  Healthlines Depression  ( ISRCTN27508731 ) on 26 June 2012; and  Healthlines CVD  ( ISRCTN14172341 ) on 5 July 2012    Electronic supplementary material  The online version of this article (doi:10.1186/s13063-015-0820-0) contains supplementary material, which is available to authorized users.

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Improving recruitment to a study of telehealth management for long-term conditions in primary care: two embedded, randomised controlled trials of optimised patient information materials