Table 2.
Summary results of methodological quality of the included meta‐analyses through A Measurement Tool to Assess Systematic Reviews (AMSTAR‐2) items
| Items | n (%) | |
|---|---|---|
| 1 | Did the research questions and inclusion criteria for the review include the components of PICO (population, intervention, control group and outcome)? | Yes = 27 (100) |
| 2 | Did the report of the review contain an explicit statement that the review methods were established prior to conduct of the review and did the report justify any significant deviations from the protocol? |
Yes = 10 (37) No = 17 (63) |
| 3 | Did the review authors explain their selection of the study designs for inclusion in the review? | Yes = 27 (100) |
| 4 | Did the review authors use a comprehensive literature search strategy? |
Yes = 25 (93) No = 2 (7) |
| 5 | Did the review authors perform study selection in duplicate? |
Yes = 26 (96) No = 1 (4) |
| 6 | Did the review authors perform data extraction in duplicate? |
Yes = 26 (96) No = 1 (4) |
| 7 | Did the review authors provide a list of excluded studies and justify the exclusions? |
Yes = 26 (96) No = 1 (4) |
| 8 | Did the review authors describe the included studies in adequate detail? |
Yes = 26 (96) No = 1 (4) |
| 9 | Did the review authors use a satisfactory technique for assessing the RoB in individual studies that were included in the review? |
Yes = 24 (89) No = 3 (11) |
| 10 | Did the review authors report on the sources of funding for the studies included in the review? |
Yes = 24 (89) No = 3 (11) |
| 11 | If meta‐analysis was justified did the review authors use appropriate methods for statistical combination of results? | Yes = 27 (100) |
| 12 | If meta‐analysis was performed did the review authors assess the potential impact of RoB in individual studies on the results of the meta‐analysis or other evidence synthesis? |
Yes = 12 (44) Partial yes=2 (7) No = 13 (48) |
| 13 | Did the review authors account for RoB in individual studies when interpreting/discussing the results of the review? |
Yes = 16 (59) Partial yes=2 (7) No = 9 (34) |
| 14 | Did the review authors provide a satisfactory explanation for, and discussion of, any heterogeneity observed in the results of the review? |
Yes = 19 (70) Partial yes=1 (4) No = 7 (26) |
| 15 | If they performed quantitative synthesis did the review authors carry out an adequate investigation of publication bias (small study bias) and discuss its likely impact on the results of the review? |
Yes = 17 (63) Partial yes=4 (15) No = 6 (22) |
| 16 | Did the review authors report any potential sources of conflict of interest, including any funding they received for conducting the review? |
Yes = 25 (93) No = 2 (7) |
RoB, risk of bias.