extremely significantp-value<0.01
Meta-analysis showed that maternal circulating sHLA-G concentration was not significantly associated with RIF (SMD -0.81, 95%CI -2.84~-1.21, p-value=0.432) with extremely significant heterogeneity (I 2 = 95.4%, p-value<0.01) ( Figure 6 and Supplementary Table 6 ).