An Overview of Systematic Reviews of Using Chinese Medicine to Treat Polycystic Ovary Syndrome

Table 4

GRADE quality-of-evidence ratings for pregnancy rate.

Included systematic reviews	Number of studies included	Pregnancy rate effect (95% CI)	GRADE quality of evidence	Relegation factors
Yan Lun et al. 2015 [17]	16	OR = 3.44, 95% CI (2.66, 4.43)	Low	①④
Xiao Chao 2016 [18]	9	RR = 1.91, 95% CI (1.59, 2.29)	Low	①⑤
Li Nan et al. 2017 [19]	12	OR = 2.96, 95% CI (2.35, 3.74)	Very low	①④⑤
Lu RuLing et al. 2018 [20]	8	OR = 3.34, 95% CI (2.23, 5.02)	Very low	①②④⑤
Xu LiFang et al. 2018 [21]	18	OR = 3.83, 95% CI (2.95, 4.96)	Very low	①④⑤
Xu Huayun et al. 2018 [22]	11	RR = 1.70, 95% CI (1.39, 2.09)	Moderate	①
Huang Wenfang et al. 2018 [23]	3	OR = 1.97, 95% CI (1.19, 3.25)	Very low	①④⑤
Liu Ying et al. 2019 [24]	11	RR = 1.71, 95% CI (1.46, 2.01)	Low	①⑤

Note. CI: confidence interval; OR: odds ratio; RR: relative risk; ①: limitation; ②: inconsistency; ③: indirectness; ④: publication bias; ⑤: imprecision.