VDR and vitamin D deficiency: Vitamin D deficiency (aOR = 3.311, 95% CI: 1.584–6.921, p = 0.0010) was significantly associated with a three-fold increase in preeclampsia risk, whilst VDR gene variants, particularly the "bb" genotype (cOR = 0.227, 95% CI: 0.055–0.944, p = 0.0410) was associated with reduced risk of PE.