Mean weighted effect size computed for “trait” and “state” hedonic studies.

Note: ES = Mean Weighted Effect Size; apositive effect size values mean patients with schizophrenia demonstrate more trait anhedonia symptom than healthy controls. bpositive effect size values mean patients with schizophrenia demonstrate more hedonic or exciting experience than healthy controls. cpositive effect size values mean patients with schizophrenia demonstrate more aversive or calm experience than healthy controls. We also presented data (overall) regarding with valence and arousal, respectively, which combined studies using either bipolar or unipolar scales to assess hedonic or exciting experience.