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INTRODUCTION: Online tools are increasingly utilized in clinical trial recruitment. A/B testing is an effective technology used in political campaigns and commercial marketing to improve contributions or sales. However, to our knowledge, A/B has not been described in the context of clinical trial recruitment. METHODS: Two A/B testing experiments were implemented on the recruitment website of the Study To Understand Fall Reduction and Vitamin D in You (STURDY), a response-adaptive, two-stage, randomized controlled trial. Commercial A/B platforms randomized web-users to different versions of the trial's website landing page; Experiment 1 included two infographic versions and Experiment 2 included three video versions. We compared web-user engagement metrics between each version and the original landing page. We determined the effect of each version compared to the original landing page on the likelihood of a web-user to (1) request more information about the trial, (2) complete a screening visit, or (3) enroll in the trial. RESULTS: A total of 2605 and 374 web-users visited the trial's website during Experiment 1 and 2, respectively. Response to the online interest form significantly differed by infographic version in Experiment 1. The number of individuals who engaged with website content and pages significantly differed by video in Experiment 2. CONCLUSION: In a pilot study implementing A/B testing of a clinical trial recruitment website, different versions of the website led to differences in web-user engagement and interest in the trial. A/B testing tools offer a promising approach to test the effectiveness of clinical trial recruitment materials and to optimize recruitment campaigns.

OBJECTIVES: To determine the feasibility of a low sodium meal plan intervention aimed at reducing seated blood pressure (BP) in residents of a government-subsidized congregate, senior living facility. METHODS: The Satter House Trial of Reduced Sodium Meals (SOTRUE) was an individual-level, masked, randomized, controlled pilot study, testing the feasibility of administering a low versus typical sodium meal plan to adult residents of Jack Satter House, a section 202 congregate living facility in Revere, MA, subsidized by the Federal Department of Housing and Urban Development (HUD). Adults over age 60 years received 3 isocaloric meals with two snacks daily over a 14-day period. Both meal plans were equivalent in potassium and macronutrients, but differed in sodium density ( 2 mg/kcal). The primary outcome was seated systolic BP (SBP) averaged over 2 visits (days 10 and 14) using an Omron HEM-907XL automated cuff. Our objective measure of compliance was morning urine sodium-creatinine ratio. RESULTS: We randomized 20 participants (95% women, 95% white, and mean age 78 +/− 8 years), beginning in October 7, 2019. Baseline characteristics were evenly distributed between groups. Dietary compliance was high (only 2 discontinued meals) and follow-up was 100% with the last participant ending November 4, 2019. Baseline SBP changed from 121 to 116 mm Hg on the typical sodium meal plan (N = 9; mean difference of −5 mm Hg; 95% CI: −18, 8) and 123 to 112 mm Hg on the low sodium meal plan (N = 11; mean difference of −11 mm Hg; 95% CI: −15.2, −7.7). Compared to the typical sodium meal plan, the low sodium meal plan non-significantly reduced SBP by 5 mm Hg (95% CI: −14, 4) and non-significantly reduced urine sodium-creatinine ratio (%-difference −36.0; 95% CI: −60.3, 3.4). Effects on SBP were greater in the subgroup using hypertension medications at baseline (−13 mm Hg; 95% CI: −26, −0) and changes in SBP from baseline were correlated with changes in urine sodium-creatinine ratio (Pearson's r = 0.31). ...