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Risk ratio and risk difference of hospitalization. aData were standardized using the inverse probability of treatment weighting method; the risk ratio was calculated using the exposed (baloxavir) group as the denominator and the neuraminidase inhibitor (NAI) group (oseltamivir, zanamivir, or laninamivir) as the numerator. Risk difference was the incidence of the outcome end point in the NAI group minus the incidence in the baloxavir group. Abbreviation: CI, confidence interval.
