2. Questionnaires Chinese version of the Conners' Parent Rating Scale-Revised: Short Form (CPRS-R: S) A 27-item parent-reported rating scale for the assessment of behavioral symptoms, with four subscales: Oppositional (6 items), Inattention/Cognitive Problems (6 items), Hyperactivity/Impulsivity (6 items), and ADHD-index (12 items), was used. Each item is rated on a 4-point Likert scale—0 for not true at all (never, seldom), 1 for just a little true (occasionally), 2 for pretty much true (often, quite a bit), and 3 for very much true (very often, very frequent) (Gau et al., 2006).