3.4.1 Mortality rate
Nineteen studies were included, which including 1070 patients, with 542
in the CRRT group and 528 in the control group. There was no statistical
heterogeneity among the studies. The fixed effect model was used to
combine the effect sizes. The results showed that the mortality rate of
the CRRT group was significantly lower than that of the control group,
and the difference was statistically significant(RR=0.44,95%CI0.34 to
0.57,P<
0.000001)(Fig.3).