Excluded study
|
Pooled RR (95% CI)
|
Pheterogeneity; I2
|
---|
Hu (2001) [32]
|
1.22 (1.13, 1.32)
|
0.03; 51%
|
Cao (2008) [33]
|
1.22 (1.13, 1.32)
|
0.03; 51%
|
Li (2008) [34]
|
1.23 (1.13, 1.33)
|
0.02; 52%
|
Deng and Su (2010)a [31]
|
1.23 (1.13, 1.34)
|
0.02; 52%
|
Deng and Su (2010)b [31]
|
1.24 (1.14, 1.35)
|
0.02; 52%
|
Mu (2012) [35]
|
1.21 (1.13, 1.31)
|
0.04; 48%
|
Zhang (2013) [36]
|
1.24 (1.17, 1.30)
|
0.38; 7%
|
Lv (2014) [37]
|
1.21 (1.13, 1.31)
|
0.04; 48%
|
Zhang (2014) [38]
|
1.19 (1.13, 1.27)
|
0.19; 27%
|
Lan and Yuan (2016) [39]
|
1.22 (1.13, 1.32)
|
0.02; 51%
|
Liu et al. (2016) [40]
|
1.23 (1.13, 1.33)
|
0.02; 52%
|
Li (2016) [41]
|
1.23 (1.14, 1.33)
|
0.02; 52%
|
- RR relative risk, CI confidence interval
- a high dosage; b low dosage