Table 2 Results from the meta-analysis, pooled survival estimates and heterogeneity statistics

 Fixed effects I-V estimate (95% CI)

0.953 (0.949, 0.957)

0.831 (0.825, 0.837)

0.535 (0.521, 0.549)

 Random effects D-L estimate (95% CI)

0.943 (0.927, 0.96)

0.811 (0.769, 0.853)

0.565 (0.462, 0.668)

 I² (%)

89.6

97.2

97.7

 Q

115.93 (P < 0.001)

422.5 (P < 0.001)

532.32 (P < 0.001)

 Tau (% points)

2.45

7.28

18.25

 Fixed effects I-V estimate (95% CI)

0.883 (0.877, 0.888)

0.682 (0.675, 0.689)

0.353 (0.341, 0.364)

 Random effects D-L estimate (95% CI)

0.869 (0.837, 0.901)

0.674 (0.608, 0.74)

0.414 (0.329, 0.499)

 I² (%)

95.3

98.6

97.7

 Q

213.56 (P < 0.001)

727.14 (P < 0.001)

427.44 (P < 0.001)

 Tau (% points)

4.58

10.77

13.71