Table 2. Quality assessments of RCTs with Jadad Score (N = 4).

Items	Score Standard			Study ID
	0	1	2	Bolla et al. 1997 [12]	D'Amico et al.2004 [13]	Pilepich et al.1997 [14]	Miljenko, et al. 2001 [15]
Randomization	Not randomized or inappropriate method of randomization.	The study was described as randomized.	The method of randomization was described appropriately.	2	2	2	2
Double blinding	No blind or inappropriate method of blinding.	The study was described as double blind.	The method of double blinding was described appropriately.	0	0	0	0
Withdrawals and dropouts	Not describe the follow-up.	A description of withdrawals and dropouts.	/	1	1	1	1
Score summaries	/	/	/	3	3	3	3

The full mark for Jadad Score was 5-point. Scores ≥3 was considered with high-quality.