Study leave out | Pooled RR | 95% CI | P value | Heterogeneity (P value, I²) |
Arnold 2009 [12] | 0.76 | [0.64, 0.90] | 0.001 | (0.26, 20%) |
Buchfelder 2007 [14] | 0.74 | [0.63, 0.88] | 0.0005 | (0.45, 0%) |
Brignardello 2015 [13] | 0.76 | [0.64, 0.89] | 0.001 | (0.28, 18%) |
Child 2015 [20] | 0.77 | [0.64, 0.94] | 0.008 | (0.23, 24%) |
Hartman 2013 [15] | 0.8 | [0.67, 0.95] | 0.01 | (0.31, 15%) |
Hatrick 2002 [16] | 0.77 | [0.65, 0.91] | 0.002 | (0.23, 24%) |
Mackenzie 2013 [17] | 0.76 | [0.64, 0.90] | 0.001 | (0.26, 21%) |
Olsson 2009 [18] | 0.76 | [0.64, 0.91] | 0.003 | (0.22, 25%) |
Olsson 2012 [19] | 0.81 | [0.69, 0.96] | 0.02 | (0.70, 0%) |
Olsson 2017 [21] | 0.75 | [0.63, 0.90] | 0.002 | (0.24, 23%) |
None | 0.77 | [0.65, 0.90] | 0.001 | (0.3, 15%) |