Table 1.

Critical appraisal worksheet summary for clinical trial

Author, Year, Country	Randomized assignment of subjects	Similar groups at baseline	Equal treatment of groups	Intention to treat analysis	Double blinded study design	Examiners calibrated	Large effect size	Precision of estimate	External validity	Extent to which criteria were met
Fung et al.[16]; 2018, Hong Kong	Yes	Yes	Yes	Not mentioned	Yes	Yes	Yes	Yes	Yes	8 out of 9 criteria met
Yee et al.[17]; 2009, Nepal	Done, method of random allocation not described	Yes	No	No	Not mentioned	Yes	No	Yes	Yes	4 out of 9 criteria met
Chu et al.[7]; 2002, China	Not mentioned	Yes	No	No	No. Single blind	Yes	Yes	Yes	Yes	5 out of 9 criteria met
Llodra et al.[18]; 2005, Cuba	Done, method of random allocation not described	Yes	Yes	No	No. Single blind	Yes	Yes	Yes	Yes	6 out of 9 criteria met