Table 3.

Summary of positive results with meta-analysis and clinical efficiency.

Author, year	Number of studies included (population)	Main outcome
Hu et al., 2009 [13]	11 (858)	OR = 3.30 [95% CI, 2.22–4.91]
Xu et al., 2010 [14]	9 (996)	OR = 3.15 [95% CI, 2.22–4.48]
Xiong et al., 2014 [15]	21 (2822)	OR = 3.59 [95% CI, 2.87–4.48]
Ye et al., 2010 [16]	45 (4027)	OR = 3.14 [95% CI, 2.65–3.73]
Yang and Zeng, 2012 [17]	27 (2583)	RR = 1.21 [95% CI, 1.17–1.26]
Liu et al., 2014 [18]	9 (885)	OR = 3.69 [95% CI, 2.52–5.42]
Peng et al., 2010 [19]	27 (3010)	OR = 3.83 [95% CI, 3.10–4.73]
Ma et al., 2012 [20]	13 (1072)	RR = 1.22 [99% CI, 1.14–1.31]