Table 2.
Risk of bias summary: review authors’ judgements about each risk of bias item for each included study
| Author, year | Randomization sequence generation | Blinding method | Withdrawals and dropouts | Jadad score |
|---|---|---|---|---|
| Han, 2013 | Not described in detail | Not mentioned | 2 Drop out of family reason | 2 |
| Zhang, 2014 | Not described in detail | Not mentioned | Not mentioned | 1 |
| Yang, 2014 | Random number table | Double-blind manner | Not mentioned | 4 |
| Rosa, 2015 | Covariate adaptive randomization method | Double-blind manner | Not mentioned | 4 |
| Sun, 2015 | Not described in detail | Not mentioned | Not mentioned | 1 |
| Hellen, 2015 | Not described in detail | Double-blind manner | 2 Drop out of personal reason | 4 |
| Kyongsik, 2016 | Random number generator from the Matlab software | Double-blind manner | Not mentioned | 4 |
| Long, 2016 | Not described in detail | Not mentioned | Not mentioned | 1 |
| Wu, 2017 | Random number table | Single-blind manner | 7 Drop out of a change in condition or other reasons | 3 |
| Giacomo, 2017 | Not described in detail | Not mentioned | Not mentioned | 3 |
| Prasad, 2018 | Not described in detail | Double-blind manner | 1 Did not tolerate the treatment | 4 |
CNKI: China National Knowledge Information database; MCI, mild cognitive impairment; RCT, randomized controlled trial; VIP: Chinese Science and Technology Periodical Database