The total score ranges from 30 to 120, with a
higher score indicating greater impulsivity.21 The 25 items of the Chinese version of the BIS - 11 have demonstrated good overall internal consistency in Taiwanese adolescents, with a Cronbach's α of 0.834.19 The
factor structure of the Chinese version of the BIS - 11 consists of three
factors: «inability to plan», «lack of self - control» and «
novelty seeking».