The meta-analysis depicted in Figure 3 demonstrated that the association between the risk of preeclampsia and maternal VDR polymorphisms (rs2228570, rs1544410, rs731236, and rs7975232) was not statistically significant (additive model, OR 1.14, 95% CI 0.85 to 1.54, I2 = 81.9%; n = 4; dominant model, OR 1.29, 95% CI 0.92 to 1.80, I2 = 76.4%, n = 4; recessive model, OR 1.11, 95% CI 0.75 to 1.65, I2 = 69.8%, n = 4). The gene discussed is VDR; the disease is preeclampsia.