TABLE 4.

Modified Jadad scale of included trials.

Author (year)	Generation of randomization Allocation sequence (0–2 points)	Randomization allocation Concealment (0–2 points)	Blinding (0–2 points)	Dropouts and withdrawals (0–1 point)	Modified Jadad scale (0–7 point)
Wang and Chen (2013)	1	1	0	1	3
Fang (2013)	1	1	1	1	3
Zhu et al. (2014b)	1	1	0	1	3
Zhu et al. (2014a)	1	1	0	1	3
Dai et al. (2016)	1	1	2	1	5
Zhou (2016)	1	1	2	1	5
Zeng (2017)	2	1	0	1	4
Liu (2019)	1	1	0	1	3
Wang (2002)	1	1	1	1	4
Zeng et al. (2017)	2	1	0	1	4
Bai (2009)	1	1	0	1	3
Zhao (2003)	1	1	1	1	4