Mindfulness‐based psychological interventions for improving mental well‐being in medical students and junior doctors

Background Mindfulness interventions are increasingly popular as an approach to improve mental well‐being. To date, no Cochrane Review examines the effectiveness of mindfulness in medical students and junior doctors. Thus, questions remain regarding the efficacy of mindfulness interventions as a preventative mechanism in this population, which is at high risk for poor mental health. Objectives To assess the effects of psychological interventions with a primary focus on mindfulness on the mental well‐being and academic performance of medical students and junior doctors. Search methods We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, Embase and five other databases (to October 2021) and conducted grey literature searches. Selection criteria We included randomised controlled trials of mindfulness that involved medical students of any year level and junior doctors in postgraduate years one, two or three. We included any psychological intervention with a primary focus on teaching the fundamentals of mindfulness as a preventative intervention. Our primary outcomes were anxiety and depression, and our secondary outcomes included stress, burnout, academic performance, suicidal ideation and quality of life. Data collection and analysis We used standard methods as recommended by Cochrane, including Cochrane's risk of bias 2 tool (RoB2). Main results We included 10 studies involving 731 participants in quantitative analysis. Compared with waiting‐list control or no intervention, mindfulness interventions did not result in a substantial difference immediately post‐intervention for anxiety (standardised mean difference (SMD) 0.09, 95% CI ‐0.33 to 0.52; P = 0.67, I2 = 57%; 4 studies, 255 participants; very low‐certainty evidence). Converting the SMD back to the Depression, Anxiety and Stress Scale 21‐item self‐report questionnaire (DASS‐21) showed an estimated effect size which is unlikely to be clinically important. Similarly, there was no substantial difference immediately post‐intervention for depression (SMD 0.06, 95% CI ‐0.19 to 0.31; P = 0.62, I2 = 0%; 4 studies, 250 participants; low‐certainty evidence). Converting the SMD back to DASS‐21 showed an estimated effect size which is unlikely to be clinically important. No studies reported longer‐term assessment of the impact of mindfulness interventions on these outcomes. For the secondary outcomes, the meta‐analysis showed a small, substantial difference immediately post‐inter