Fig. 2From: Exercise-induced increase in brain-derived neurotrophic factor in human Parkinson's disease: a systematic review and meta-analysisSummary effect sizes for outcome of change in BDNF levels. Green squares indicate individual SES. Black colored diamond indicates the summary effect size; RCT randomized clinical trial, SD standard deviation, Std standardized, CI Confidence Interval, I2 statistic to determine heterogeneity, Z z-scoreBack to article page