BDNF and stroke disorder: STATA 12.0 software was used to compute the standardized mean difference (SMD) and 95% confidence interval (CI) regarding the comparison of serum BDNF in PSD and stroke patients without PSD.<h4>Results</h4>We collected the mean value and standard deviation (SD) of serum BDNF in PSD and stroke patients without PSD from six studies (PSD: <i>n</i> = 268, stroke patients without PSD: <i>n</i> = 425).