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Multivariable model 2 in Table 2 and 3 was used. Plasma 25(OH)-vitamin D (25(OH)D) was divided to quartiles (Q1–Q4), vitamin D receptor (VDR) gene polymorphisms were categorized to dominant model for BsmI and recessive model for FokI, according to their respective relation with risk of hypertension. Interaction was tested using likelihood ratio test.
Joint association of plasma 25(OH)-vitamin D and vitamin D receptor gene polymorphisms with the risk of hypertension
