Uebelacker LA, et al. - This analysis was performed to ascertain if treatment program preference, credibility, or expectancy predict engagement in depression interventions (yoga or a control class) or depression symptom severity over time. A randomized controlled trial (RCT) of yoga vs health education was performed for people with depression. With yoga, higher expectancies for improvement were associated with more improvement. In the control arm, expectancy for improvement was not associated with improvement. A trend for a similar pattern for credibility was noted. Researchers observed no association of expectancy and credibility with intervention adherence. Results thereby suggest improvement in the likelihood of success with expectancy only for an intervention thought to actively target depression (yoga) and not a control intervention.