Significance of an additional unenhanced scan in computed tomography angiography of patients with suspected acute aortic syndrome

Table 1 Stanford classification, age and gender distribution

	AAD			IMH
n (%)	43 (76.8)			13 (23.2)
mean age (yr)	66 ± 12			69 ± 10
	Stanford A	Stanford B	A vs B	Stanford A	Stanford B	A vs B
	55.8%	44.2%		53.8%	46.2%
mean age (yr)	66 ± 11	67 ± 13	P = 0.785	65 ± 10	75 ± 13	P = 0.146
Female	41.7%	10.5%	P = 0.039	28.6%	50%

There is no significant difference in the age distribution between Stanford A and B within the entities of acute aortic dissection (AAD) and intramural hematoma. Though, in AAD there is a significant difference in the gender distribution between Stanford A and B dissections. Females showed a significantly higher percentage of type A than type B AAD. AAD: Acute aortic dissection; IMH: Intramural hematoma.