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Cox regression analysis for the comparison of time variables between the groups. Cox regression analysis showed no significant difference between the IVIG group and control group in (a) the duration of fever (HR 0.739, 95% CI 0.478–1.142, p = 0.173), (b) the time to virus clearance (HR 0.718, 95% CI 0.500–1.033, p = 0.074), or (c) the length of hospital stay (HR 0.701, 95% CI 0.480–1.023, p = 0.701) during the follow-up period.
