Cognitive impairment assessment
mental retardation, intellectual disability, Cognitive impairment
Cognitive impairment was evaluated by Montreal cognitive assessment (MoCA) and mini‐mental state examination (MMSE) scales. MoCA includes cognitive domains such as attention and concentration, memory, executive function, visual structural skills, language, abstract thinking, calculation, and orientation. The total score is 30 points, and 26–30 points are normal. MMSE includes immediate memory, time‐oriented force, location‐oriented force, delayed memory, language, visual space, attention and calculation, etc. The total score is 30 points, 27–30 is normal, 21–26 is mild mental retardation, 10–20 points is moderate intellectual disability, 0–9 points is severe intellectual disability. The intragroup correlation coefficient of the MMSE joint examination was .99, and the MoCA scale Cronbach's alpha was .83.