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Ratio of oxygen arterial pressure to oxygen inspiratory fraction (PaO2/FiO2) with regard toSFTPA2genetic variants. PaO2/FiO2 with regard to alleles and haplotypes (a) as well as genotypes and diplotypes (b) of SFTPA2 in hospitalized patients with H1N1 pandemic 2009 influenza A virus infection. Each bar represents the mean ± SD. P values were calculated with a regression lineal model, including the variables age, gender, risk factors, secondary bacterial pneumonia, and bacteremia.
