Table 4.

The risk factors for 30-day mortality of patients hospitalized with Flu-p in China, 2013–2019

Variable	P-value	aHR (95% CI)
Influenza virus A infection	0.024	2.637 (1.134–6.131)
Age	<  0.001	1.055 (1.033–1.077)
Cardiovascular disease	<  0.001	7.683 (3.175–18.589)
Smoking history	<  0.001	3.137 (1.417–7.124)
Lymphocytes < 0.8 × 109/L	<  0.001	10.473 (5.033–21.792)
BUN > 7 mmol/L	0.004	3.170 (1.449–6.935)
Arterial pH < 7.35	0.001	3.037 (1.552–5.945)

aHR adjusted hazard ratio, CI Confidence interval, BUN: Blood urea nitrogen