Table 3.

Prognostic Factors that May Affect the Fever-Alleviation Time

Variable	HR (95% CI)	P Value
Antiviral agent (peramivir/oseltamivir)	1.461 (0.887–2.408)	.14
Virus type (type A/type B)	0.449 (0.239–0.843)	.01
Sex (male/female)	1.518 (0.950–2.425)	.08
Chronic cardiac disease (no/yes)	1.579 (0.835–2.986)	.16
Chronic liver disorders (no/yes)	2.091 (0.974–4.487)	.06

Results were obtained by using a Cox proportional hazard model that incorporated all of the prognostic factors, with the exception of the 5 factors in the table; these excepted factors instead were examined by variable selection using a stepwise method (a significance level of .2 to allow a variable into the model and to stay in the model).Abbreviations: CI, confidence interval; HR, hazard ratio.