Table 3.

Crude clinical outcome of operative patients stratified by months with high and low influenza activity for acute type A aortic dissections admitted to the University of Michigan Medical Center between 10/2009 and 4/2019 (n = 433).

	High influenza activity months (n = 191)	Low influenza activity months (n = 242)	p-value
Surgery delay (days)	1.32	0.93	0.13
Length of Admission (days)	13.51	13.95	0.33
Post-Op Pneumonia	16.23%	15.70%	0.44
Emergent Status	83.68%	84.30%	0.43
In hospital Mortality	10.99%	5.79%	0.024
30-day mortality	9.68%	5.44%	0.048