The stepwise binary logistic regression analysis showed that higher HAMA score (OR = 1.089, 95% CI = 1.010-1.174, P = 0.026), higher motor symptoms at night domain score from the PDSS-2 (OR = 1.389, 95% CI = 1.128-1.711, P = 0.002) and lower MOCA score (OR = 0.864, 95% CI = 0.757-0.986, P = 0.030) were correlated with RBD.