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| Study | Inclusion criteria of cognitive impairment | Style of Tai Chi |
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| Kasal 2010 [26] | (i) Memory complaint offered by the patient or by family members over the previous year; (ii) screening score of the Rivermead Behavioral Memory Test lower than 10; (iii) Mini-Mental State Examination (MMSE) within normality, corrected by educational level | Yang style |
| Lam 2012 [27] | (i) CDR of 0.5 or (ii) neuropsychological criteria for amnestic-mild cognitive impairment (MCI) with subjective cognitive complaints [21]; objective memory impairment with reference to delayed recall of list learning test at greater than or equal to 1.5 SD below education- and age-matched subjects with CDR 0; (iii) no previous regular practice of Tai Chi or other mind-body exercise for more than 6 months | Yang 24-form style |
| Li 2014 [28] | (i) Having MMSE scores between 20 and 30 | N/A |
| Tai 2016 [21] | (i) Alzheimer with a Clinical Dementia Rating (CDR) score of 0.5–1; (ii) upper limb mobility sufficient to perform requisite finger-pointing tasks, such as flexing and extending the shoulder, elbow, wrist, and fingers | Yang style |
| Sungkarat 2017 [29] | (i) Petersen’s criteria for diagnosing amnestic multiple-domain MCI (a-MCI) had scores of 24 or greater on the Mini-Mental State Examination (MMSE) and less than 26 on the Montreal Cognitive Assessment (MoCA), had adequate memory if cued, and comprehended instructions required for study participation | 10-form style |
| Siu 2018 [30] | (i) The CMMSE screening score ranging from 19 to 28, which was corrected based on educational level (≥18 for illiterate respondents and ≥22 for those having received more than two years of schooling) | Yang style |
| Huang 2019 [16] | (i) Diagnosed with dementia based on the diagnostic criteria 128 of the Diagnostic and Statistical Manual of Mental 129 Disorders, 4th edition; (ii) a clinical dementia 130 rating score <2 | N/A |
| Wang 2019 [31] | (i) According to the diagnostic criteria set by the National Institute on Aging and the Alzheimer’s Association (NIA, AA), the patients were screened as MCI, i.e., subjective cognitive function: the patients who complained or knew about cognitive impairment; (ii) objective cognitive function: according to the Peking Union Medical College, version of the total score of MoCA-p is 25 for the elderly aged 65–79 and 2l–24 for the elderly aged 80–85; (iii) the total score of activities of daily living (ADL) is ≤26, and the complex engineering daily living (ADL) is ≥10 | 8-form style |
| Bao 2019 [32] | (i) Having memory decline; (ii) the course of disease was more than 3 months; Global Deterioration Scale (GDS) was 2–3, Clinical Dementia Rating Scale was 0.5, memory test score was below 1.5 standard deviation of age and education matched control group, MMSE score met illiteracy (18–21), primary school culture (21–24), secondary school culture (25–27), and daily life ability score was lower than 26; (iii) memory impairment and other aspects of cognitive function retention | Yang style |
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