Assessment of Anxiety symptoms
Zung’s Self-Rating Anxiety Scale (SAS) was used [30]. The SAS considered both emotional and physical symptoms, including 20 items, of which 15 were negative experiences and 5 were positive experiences. Add all the items together to form a rough score, which is multiplied by 1.25 and rounded to get the standard score to evaluate anxiety. The index score of 45 (original score=36) was set as the cut-off point for clinical significant anxiety in our study [31]. The Cronbach’s alpha of it was 0.918 in this study.