VDR and Sepsis: VDR Apa I polymorphism and its association with sepsis, there was no obvious heterogeneity in the allelic contrast model (I2 = 0%, P = .44), the dominant genetic model (I2 = 37%, P = .19), and the recessive genetic model (I2 = 0%, P = .41), so the Mantel-Haenszel fixed effects model was applied.