Table 2.

Quality appraisal results

Modified AMSTAR-2 items	Alabdullah et al., 2018	Daniel et al., 2013	Estai et al., 2018	Flores et al., 2020	Fortich-Mesa & Hoyos, 2020	Troconis et al., 2018
1	N	N	N	N	N	N
2	N	N	N	N	N	N
3	N	N	Y	N	N	N
4	N	N	PY	PY	N	N
5	Y	Y	Y	Y	Y	N
6	N	N	N	N	N	N
7	N	N	N	N	N	N
8	PY	N	PY	N	N	N
9	Y	N	N	Y	PY	N
10	N	N	N	N	N	N
11	No MA	No MA	No MA	No MA	No MA	No MA
12	No MA	No MA	No MA	No MA	No MA	No MA
13	N	N	N	N	N	N
14	N	N	N	N	N	N
15	No MA	No MA	No MA	No MA	No MA	No MA
16	Y	N	Y	Y	Y	N
Overall confidence rate	Critically low-quality review	Critically low-quality review	Critically low-quality review	Low quality review	Critically low-quality review	Critically low-quality review
Key: N = No Y = Yes PY = Partial yes No MA = No meta-analysis conducted