The Effect of Berberine on Polycystic Ovary Syndrome Patients with Insulin Resistance (PCOS-IR): A Meta-Analysis and Systematic Review

Table 2

Quality assessment of included trials.

No.	Trials	Random allocation	Allocation concealment	Blinding	Loss to follow-up	Jadad score
1	KUANG Heng (2014)	2	1	1	1	5
2	AN Yuan et al. (2014)(2016)	1	1	2	1	5
3	LI Xiaobin et al. (2017)	2	1	1	1	5
4	WANG Lingxiao et al. (2011)	1	1	1	1	4
5	WANG Ping et al. (2016)	1	1	1	1	4
6	MA Yukun et al. (2011)	1	1	1	1	4
7	WEI Wei et al. (2012)	2	1	2	1	6
8	ZHU Qiuyan et al. (2016)	2	1	2	1	6
9	CHEN Xiao et al. (2016)	2	1	1	1	5

Notes: The standards for evaluation:
Random allocation: 2: appropriate random allocation was used; 1: random allocation was used but the method was unclear; 0: random allocation was inappropriately used or was not used.
Allocation concealment: 2: appropriate allocation concealment was used; 1: allocation concealment was used but the method was unclear; 0: the allocation concealment was inappropriately used or was not used.
Blinding: 2: appropriate blinding was used; 1: blinding was used but the method was unclear; 0: the blinding was inappropriately used or was not used.
Loss to follow-up: 1: the number and reason of loss to follow-up were described; 0: the number and reason of loss to follow-up were not described.
Jadad score: 1-3: low quality; 4-7: high quality.