Table 2.

Evaluation of methodological qualities of included randomized controlled trials

Items/author	Huber	Jiang	Okkabaz	Parc	Doeksen	Machado	Marti
Described as randomized	1	1	1	1	1	1	1
Appropriate randomization method described	1	1	1	1	1	1	1
Subject blinded to intervention	0	0	1	0	0	0	0
Evaluator blinded to intervention	0	0	0	0	0	0	0
Description of withdrawals and dropouts	0	1	1	1	1	1	1
Score	2	3	4	3	3	3	3

Methodological qualities of included randomized controlled trials were assessed by modified Jadad score system. Total score, 5; 1–2, low quality trial; 3–5, high quality trial