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The effects of standardized mindfulness-based interventions on time domain heart rate variability (HRV) parameters: standard deviations of normal-to-normal R-R intervals (SDNN) (panel A) and root mean square standard deviations of R-R intervals (RMSSD) (panel B). Squares indicate standardized difference in means (Hedges’ g) and lines represent 95% confidence intervals (CI); the size of the box represents the weight of each study.
