A randomized controlled trial of the online OurRelationship program with varying levels of coach support

Online programs that reduce relationship distress fill a critical need; however, their scalability is limited by their reliance on coach calls. To determine the effectiveness of the online OurRelationship program with varying levels of coach support, we conducted a comparative effectiveness trial with 740 low-income couples in the United States. Couples were randomly assigned to full-coach (ncouples = 226; program as originally designed), automatedcoach (ncouples = 145; as a stand-alone program with tailored automated emails only), contingent-coach (ncouples = 145; as an adaptive program where tailored automated emails are followed by more coaching if couples did not meet progress milestones), or a waitlist control condition (ncouples = 224). All analyses were conducted within a Bayesian framework. Completion rates were comparable across conditions (full-coach: 65 %, automated-coach: 59 %, contingent-coach: 54 %). All intervention couples reported reliable pre-post gains in relationship satisfaction compared to waitlist control couples (dfull = 0.46, dcontingent = 0.47, and dautomated = 0.40) with no reliable differences across intervention conditions. Over four-month follow-up, couples in full- and contingentcoach conditions maintained gains in relationship satisfaction and couples in the automated-coach condition continued to improve. Given the comparable completion rates and minimal differences in effect sizes across intervention conditions, all three coaching models appear viable; therefore, the choice of model can vary depending on available resources as well as couple or stakeholder preferences. This study was preregistered (ClinicalTrials.gov NCT03568565).