REN and preeclampsia: The results of the meta-analysis depicted in Figure 3 indicated that there was no statistically significant connection between the risk of preeclampsia and maternal REN polymorphisms (rs5705, rs5707, and rs2368564) under the additive, dominant, or recessive models (OR 0.97, 95% CI 0.78 to 1.19, I2 = 82.6%, n = 3; OR 0.60, 95% CI 0.26 to 1.41, I2 = 98.1%, n = 3; OR 1.02, 95% CI 0.82 to 1.27, I2 = 61.5%, n = 3).