Table 2.

Quality assessment of included studies

Author, year	Focused question	Inclusion of appropriate studies	Inclusion of eligible studies	Quality assessment of studies	Appropriateness of synthesis	Overall results of review	Accuracy of results	Applicability to local populations	Considering all relevant outcomes	Benefits vs harms/costs	Overall risk of bias
Abramson	✓	✓	✓	✓	✓	✓	✓	n/a	✓	✓	Low
Calamita	✓	✓	Unclear	✓	✓	✓	✓	n/a	✓	Unclear	Unclear
Chelladurai	✓	✓	X	✓	✓	✓	✓	n/a	✓	✓	Unclear
Compalati	✓	✓	X	✓	✓	✓	✓	n/a	✓	✓	Unclear
Erekosima	✓	✓	X	✓	n/a	✓	✓	n/a	✓	✓	Unclear
Kim	✓	✓	X	✓	✓	✓	✓	n/a	✓	✓	Unclear
Normansell	✓	✓	✓	✓	✓	✓	✓	n/a	✓	✓	Low
Polzehl	✓	✓	✓	Unclear	✓	✓	✓	n/a	✓	✓	Unclear
Tao	✓	✓	X	✓	✓	✓	✓	n/a	✓	✓	Unclear